I bought PLR rights to the Web 2.0 Bible. Below are the resouces listed in it...

You'll find:
253 free blog platforms and communities.
46 online locations and platforms to create and host a Wiki
462 Social Bookmarking Sites
414 Social Networking Communities
30 Podcast Hosts
93 Podcast Directories
227 Video Sharing Portals
27 Directories of SEO Friendly Directories
25 Forum and Message Board Directories
67 Press and Media Release Distribution Centers
20 RSS Directories