Here’s a link to one of the more useful lists I’ve seen for some time: Michele McLellan’s index of new community online news sites in the US. The Reynolds Journalism Institute in Missouri is the host of a conference on these initiatives. If you follow Jay Rosen’s tweets (@jayrosen_nyu), you’ll have already been pelted with micro-announcements.
I’ve seen attempts at a similar list for the UK but nothing quite this full or systematic. If anybody knows of one, please let me know.