The GeoBlogosphere

A List of Many Geoblogs (Geobulletin)
A List of Some Inactive Geoblogs
About Geology (good ref; defunct as a blog)
Accidental Remediation
Active Tectonics Blog
Agile*
All Over the Map
Amphibol (German)
Arizona Geology
Arizona Geology e-Magazine
Arkansas Geological Survey Blog
Bloc de Camp (Catalàn)
Carbonacea
Colorado Earth Science
confessions of a rockaholic
DC Geology Events
Diary of a Geology Student
Don't Panic Geocast
Dr. Anne Jefferson's Watershed Hydrology Lab
Earth Learning Idea
Earth Science Erratics - currently inactive but available for guest posts!
Earth-of-fire (French)
EarthSky Blogs
Earthly Musings - Wayne Ranney
Environment and Geology (Hindi)
Exploring the Earth
For the Sediment Record
GeoCastAway (Spanish)
GeoIGN2.3 (Japanese)
GeoLog (the EGU blog)
Geological Society of London blog
Geology News (Geology.com)
Geology and Earth Science Images - Marli Miller (not a blog) - now at GeologyPics
Geology and More blog (Greek)
Geology for Global Development
Geology in Motion
Geology in the West Country
Geology is Hard
Geología Venezolana (Spanish)
Geomagnetism.org
Georneys
Geosciblog
Geoscienceimaging Blog (CWCarrigan)
GeoSciTweeps
Geotripper
Geotripper Images (not a blog)
Girls into Geoscience
Gîte et découvertes de la vallée du Sant (French)
Gravel Beach
Highly Allochthonous
Iceland geology blog
In the Company of Plants and Rocks
In the Company of Volcanoes
Infogeología (Spanish)
JOIDES Resolution Blogs
Lauret Savoy | Blog
Locos por la Geologia (Spanish)
Looking for Detachment
Lounge of the Lab Lemming
Magma Cum Laude
Maitri's VatulBlog
Matkalla Maapallon Vaippaan (Finish - Traveling the Globe of the Earth)
Melting Planet
Metageologist
Mini Me Geology Blog
Mountain Beltway
MTA-ELTE Vulkanológiai Kutatócsoport (MTA-ELTE Volcanology Research Group) - Hungarian
NBMG | Blog of the Nevada Bureau of Mines and Geology
Northern Rivers Geology
Oakland Geology
OnCirculation
Ontario Geofish
Paleoseismicity.org
Peligros Geológicos en el Perú (Spanish)
Pikes Peak Pebble Pups and Earth Science Scholars
Polar Soils Blog
Porter's Papers
Rapid Uplift
Reading the Washington Landscape
Retos Terrícolas (Spanish & English)
Riparian Rap
Rock-Head Sciences
Rocks and Water
Rocky Planet
Ron Schott's Gigapan profile page
Rosetta Stones
Sandatlas (more of a reference than a blog anymore)
Sciency Thoughts
Sedimentary Lifestyle
seis-matters
Seismo Blog
Speaking of Geoscience (GSA Guest Blog)
Stories in Stone Blog
The Geochristian
The Landslide Blog
The Lost Geologist
The Pale Blue Dot
The Petrographer
The Plainspoken Scientist (AGU)
The Road to Endeavour
The Trembling Earth
The Volcanology Chronicles
TravelingGeologist
Un geólogo en apuros (Spanish) - Nahum Chazarra
Utah Geological Survey Blog
Volcanicdegassing
Volcano Blog by Tom Pering
Wandering Spheres
WATCHING FOR ROCKS-Travels of a Sharp-eyed Geologist
Wogelix
Wooster Geologists
Written In Stone...seen through my lens
The Wilds of Wyoming: A Little Bit of Culture, A Little Bit of Dirt