The GeoBlogosphere

A List of Many Geoblogs (Geobulletin)
A List of Some Inactive Geoblogs
Adventures of a Laura
Active Tectonics Blog
Arizona Geology e-Magazine
Arkansas Geological Survey Blog

Beauty of Tectonics Blog
Bloc de Camp (Catalàn)

City of Volcanoes
Colorado Earth Science
Dana Hunter's Unconformity
Don't Panic Geocast
Earth Learning Idea
Earth Science Erratics - available for guest posts!
Earth-of-fire (French)
Earthly Musings - Wayne Ranney

Earth Science Society
Environment and Geology
Explorer Multimedia Inc. Blog
GeoCastAway (Spanish)
Geological Society of London blog

GeologicTimePics Blog - by Marli Miller

Geology Blues
Geology News (Geology.com)
GeologyPics - photos by Marli Miller
Geology for Global Development
Geology in Motion
Geology in the West Country

Geology is the Way
Geología Venezolana (Spanish)
Georneys
Geosciblog
Geotripper
Geotripper Images - photos by Garry Hayes (Geotripper)
Gîte et découvertes de la vallée du Sant (French)
Highly Allochthonous

Hudson Valley Geologist
In the Company of Plants and Rocks
In the Company of Volcanoes
JOIDES Resolution Blogs
Julian's Blog
Locos por la Geologia (Spanish)
Looking for Detachment
Lounge of the Lab Lemming
Maitri's VatulBlog
Melting Planet
Metageologist
Mountain Beltway

MrHollister.com
MTA-ELTE Vulkanológiai Kutatócsoport (MTA-ELTE Volcanology Research Group) - Hungarian
My Life in the Geosciences - Yours, in LadyGeoscience
Natural Hazards and Disasters
NBMG | Blog of the Nevada Bureau of Mines and Geology
Northern Rivers Geology
Oakland Geology
Ontario Geofish
Paleoseismicity.org
Peligros Geológicos en el Perú (Spanish)

Pikes Peak Pebble Pups and Earth Science Scholars

Polar Soils Blog
Rapid Uplift
Reading the Washington Landscape
Retos Terrícolas (Spanish & English)
Riparian Rap
Rock-Head Sciences
Rocks and Water

Rocky Planet - Eric Klemetti at Discover
Ron Schott's Gigapan profile page
Rosetta Stones
Sandatlas (more of a reference than a blog)
Sciency Thoughts
Sedimentary Lifestyle
Seismo Blog
Speaking of Geoscience (GSA Guest Blog)
Stories in Stone Blog

The Coastal Paleontologist, atlantic division

The Flying Trilobite Blog
The Geochristian
The Geology P.A.G.E.
The Grumpy Geophysicist
The Landslide Blog
The Plainspoken Scientist (AGU)
The Volcanology Chronicles

TravelingGeologist
Un geólogo en apuros (Spanish) - Nahum Chazarra
Utah Geological Survey Blog
Volcano Blog by Tom Pering
Wooster Geologists
Written In Stone...seen through my lens