Blogs are passe. Tweeting on twitter.com is now mainstream and the geoscience community is embracing it. [this sentence took 85 characters, well within the twitter limit of 140, so I could have tweeted it]
I'm following four twitter feeds, albeit intermittently:
GSA's geosociety at http://twitter.com/geosociety
AGU's theAGU at http://twitter.com/theAGU
Chris Rowan's Geoblogfeed at http://twitter.com/Geoblogfeed
and our own, maintained by Mike Conway, Chief of the AZGS Geologic Extension Service, AZGeology at http://twitter.com/AZGeology
Each of these is serving primarily as an aggregator of geo-news from a wide array of sources. With RSS feeds, these sit on the tool bar above my browser. A quick click, and I see
instantaneous lists of what's happening in the world of geoscience. Many of the tweets are links to blog posts or news headlines. Some report geologic events as they are unfolding.