Design You Trust is a design blog and community that allows public posting like MetaFilter. Recent posts that I found interesting include Diz Decor Vinyl Stickers and Tetris Furniture and A Man Among Bears. This is an active community with several daily posts to choose from. [some posts nsfw]
Nerdfilter "The community blog for weirdos like you."--just opened and trying to emulate Metafilter, without the politics...take a peek.
The First Community Blog? Five years ago today, Caleb Donaldson pulled the plug on Geek Cereal, a social experiment that began on March 21, 1996. Some of the links don't work like they should anymore, but the calendar will get you to all the juicy bits. An interesting little time capsule. The site's demise is mentioned in this Ghost Sites 1997 obit, and in this virtual eulogy from Caleb's dad on MIT's website.