Lutz at Geoberg.de has compiled an impressive list of known geoblogs... 97 of them!

My hat's off to Lutz for this tremendous effort! And doubly so for taking the time to translate it into English! I nominate him as the keeper of the official list of the geoblogosphere... Do I have a second on that motion?

Anyhow, here it is:

General
About Geology by Andrew Alden - diverse geoscientific news and information
Earth Learning Idea - every week a new geodidactic idea
The Accretionary Wedge - Blog collecting the results of geoblog carnivals
EffJot by Florian Jenn (partly in German)
geoberg.de-Blog by Lutz Geissler - News and more about geosciences, especially economic geology (in German)
The GeoChristian by Kevin Nelstead - Blog about geosciences from a view of a Christian
geolismus.de by Lutz Geissler and guest authors - Blog about public relations and education in geosciences and mining (in German)
Geological Musing in the Taconic Mountains by John van Hoesen - diverse topics from field works to history of geology
Geology Happens - experiences and results of the authors field work
Geology News by Dave Schumaker - geoscientific news
Geology News by Hobart King - geoscientific news
Geotripper - geology of the Western USA
goodSchist - posts from geology to astronomy (inclusive the 'podClast')
Gunnars Geo-Blog - links to geoscientific papers and news (in German)
The Limonit Blog - diverse geoscientific topics
The Lost Geologist - geological life and research of a German geology student
Lounge of the Lab Lemming - Blog of a geochemist and field geologist
The Musings of a Life-Long Scholar - Blog of a long-life geostudent
NOVA Geoblog by Callan Bentley - diverse geoscientific topics, especially about education
Olelog by Ole Nielson from Denmark - from tectonics to volcanism, climate change, mineralogy and more
Ron Schott's Geology Home Companion Blog by Ron Schott - Blog about GigaPan (among other topics)
Terra incognita - diverse geo-topics (in Swedish)
Geo-Hazards / Geoengineering
Dave's Landslide Blog by David Petley - landslide news and research
Geomorphic Hazards by Dawn and Dave Nicholson - news and links about geo-hazards
GeoPrac.net - Blog about geoengineering and related topics
Strike Slip - news about extreme geo-cataclysms
The Great Southern California ShakeOut - official blog of the Shake Out 'event'
Geo-Information (GIS etc.)
The Geo Factor by Ron Exler - Blog about GIS, GPS etc.
Geologic Froth - blog about geoscientific data-processing with focus on GPS and GIS
MiGeo - Blog from Peru about web-based geoscientific applications (in Spanish)
Geomorphology
Arctic and Alpine by Dawn and Dave Nicholson - news, discussions and links about geomorphology in cold climates
Geophysics
Harmonic Tremors - articles about seismic and seismology
Hypo-theses - earth quakes and more
Sismordia by Alessa Maggi and others - seismology in the Antarctic
Hydrogeology / Hydrology
Ordinary High Water Mark - experiences from water research
Pools and Riffles - hdyrology of Nevada and other regions
Palaeontology
Alberta Vertebrate Palaeontological Association-Blog - vertebrate palaeontology of Arizona
Ask Dr. Vector by Matt Wedel - palaeontology and biology of mainly flying animals
Bio/Rocks by Sarah Werning - vertebrate palaeontology and biology
Dave Hone's Archosaur Musings by Dave Hone - palaeontology of dinosaurs
Dinochick by Rebecca Foster - palaeontology and other stuff
Dino Frey's Weblog by Dr. Eberhard Frey from Germany - Blog about dinosaurs (especially Pterosaurs)
Echinoblog by Christopher L. Mah - vertebrates and collection work
The Ethical Palaeontologist - some palaeontological articles
Geologia online - mainly palaeontological posts (in Italian)
The Great Dinosaur Mystery and the Big Lie by Sherry Konkus - articles about the controversial creationism and the role of dinosaurs
Laelaps by Brian Switek - Blog about evolution
The Open Source Paleontologist - Blog about open source software for Geoscientists
Palaeoblog by Michael J. Ryan - diverse palaeontological topics
Sauropod Vertebra Picture of the Week by Darren Naish, Matt Wedel and Mike Taylor - every week a new picture and additional articles about sauropods
Triloblog - Blog about trilobites
Why I hate Theropods - Blog about Mesozoic reptiles and evolution
Petrology/Mineralogy/Economic Geology
Antimonite - palaeontological and archaeological articles
GeoCosas from Chile - Blog with focus on metallogeny and tectonics (in Spanish)
Green Gabbro by Maria Brumm - diverse, often petrological topics
Looking for Detachement by Silver Fox - articles about field work and exploration
Mineraland Chile - Blog about Chilean minerals with many photographs (in Spanish)
Rocks & Minerals - a kind of encyclopedia about rocks and minerals
Quarternary Geology
Cryology and Co. - geology of ice
Regional and Local Geology
Arizona Geology by Allison - diverse geo-topics about Arizona and neighbouring states
Oakland Geology by Andrew Alden - geological outcrops in Oakland
proreg news by Michael Hahl - articles about the geology of the German Odenwald (in German)
Sedimentology
Active Margin by Jim Repka - sedimentology and geoscientific education
Clastic Detritus by B. W. Romans - blog with comprehensive articles
The Dynamic Earth - Blog with mainly sedimentological topics
Hindered Settling by Zoltan Sylvester - comprehensive geo-articles
In Terra Veritas - Blog of a sedimentologist about the geo-world
Ramblings of a Geologist by Katherine Allen - Blog about the sediments of Lake Erie and climate change
Reporting on a Revolution by Suvrat Kher - climate change, evolution and more
Ripples in Sand - Blog by a graduate student from the Rocky Mountains
Sedimentary Basins and Petroleum Geology by Paul Wilson - comprehensive geoscientific articles
Stratamodel Blog by Tom Bell - Blog about the field work of the Stratamodel Inc.
Ten Million Years of Solitude - sedimentological, Quarternary geological and climate-related topics
Structural Geology/Tectonics
Al my faults are stress related by Kim Hannula - articles about geoscientific education and climate (besides structural geology)
Apparent Dip - useful articles about geo- and thermochronology
Vulcanology
ECRIS & CEVP - comprehensive articles about the European Cenozoic Rift System (ECRIS) and the Central European Volcanic Provence (CEVP) (in German)
Eruptions by Dr. Erik W. Klemetti - Blog about active volcanos worldwide
Magma Cum Laude - blog about volcanos and their molten and solidified products
Volcano Summer - Blog about a research stay of a geology student at Mauna Loa (Hawaii)
The Volcanism Blog by Dr. Ralph Harrington - Blog about worldwide volcanos, especially Chaiten, Llaima, Kilauea and Tungurahua
Miscellaneous
Accidental Remediation - articles about environmental geology and remediation
A Thin Section - Blog of a former economic geologist with spradic posts
Branner Blog by the Branner Library (Standford University) - News about geo-libarary work
Christie at the Cape - Blog about the experiences of a geological emigrant
The Chronicles of the Angry Geologist - diverse topics, minor about geosciences
Earth Sciences and Maps Library Blog of the University of California in Berkeley - Blog about maps
Geo/Arch/Sci Blog by Ellery Frahms - articles about geoarchaeology
GeoLibros by Make Stannen from Chile - normal and e-books are presented (in Spanish)
Geology Joe - diverse topics, partly about geosciences
Ontario-geofish by Harold Asmis - diverse topics
Natural History Now! by the Utah Museum of Natural History - geological, geographical and biological topics from Utah, USA
Reel Geology - Blog about geologists and geology in movies
Rising to the Occasion - Blog about field trips and education experience
SEG Geo-Mentoring - Blog about the mentoring-program of the Society of Exploration Geophysicists
Slightly Diktytaxitic by Tom Hinterberger - reports about research, education and university life of a student
Southern Exposure - Blog about geological education
Uncommon Vistas - Blog about a travelling geologist (not really geoscientific articles)

Labels: blogs, geology