It is kind of late to do this 2007 retrospective, but what the heck. As pointed out by Ron, 2007 has been the year when a real geology blogger community started to develop. The evolution of Hindered Settling from an eclectic mix of notes about science, geology, skepticisim, atheism, technology, etc., written in Hungarian and in English (or Hunglish?), to a much more geoscience-oriented, English-only site is in part the result of this trend.
So here are a few posts from 2007 that I think should be on this list:
Photos from Brazos Bend State Park – if you live in Houston, Brazos Bend State Park is one of the best places to get away from the city and see some wildlife & nature. No mountains, of course, but at least you can look at oxbow lakes and learn about photography. For some reason, the photos I have taken there over the years have become fairly popular.
On the Great Unconformity, James Hutton, and Geologic Time
Photos and impressions from a stunning glacial lake and delta in the Canadian Rockies, with some sedimentology mixed in
On flame structures
Sedimentology on Mars – wet or dry gravity flows?
Thoughts about the Black Sea flood and its potential link to the spread of agriculture in Europe