It looks like a gaggle of geobloggers are gathering at the AGU meeting next month in San Francisco.
Kim at All of My Faults are Stress Related proposed Wednesday evening, Dec. 17 and that seems to work for a lot of others, including me, Sciencewoman (On Being a Scientist and a Woman), Ron (Ron Schott's Geology Home Companion), Andrew (About Geology), and maybe BrianR (Clastic Detritus).