The blogosphere is the set of all weblogs on the Internet.
The geoblogosphere is all weblogs on geosciencies (geology etc.). I can highly recommend most of these Blogs to my readers.
Geoblogospherons has been proposed as a new name for members of the geoblogosphere. (I think that “pheron” literally means “carrier” - correct me if I am wrong).
The GeoWiki is a new Wikipedia for Geosciences started by Ron Schott. It is found at
Ron Schott talks about the GeoWiki project he is spearheading.
In his right sidebar there is a useful list of geology feeds.