LISWiki: The Original Librarian Wiki, Still Going Strong
If you haven't stopped by LISWiki.com lately you're missing some good stuff. Have a look at What's Been Added, or maybe start with The Index, or the LISWiki Categories (even better, categorize A Page yourself).
The LISWiki:Community Portal has some good Article Ideas: Stumped on what to write about? See if you can fill out the Categories some more, develop the shorter entries (some are blank) and stubs, or help fill the needed entries (titles linked to twice or more), or just browse the Recent Changes. Don't miss the Largest List Of Library Blogs on the web!
Wikis are free and open publishing systems. You, yes you, are encouraged to share information in your areas of interest or expertise. Anyone can edit existing articles or create new ones. New articles are welcome! If it doesn't already exist, a "create an article with this title" link will appear in a search for your article title.