Wikis can be a fine educational tool

Friends, see here:

"All educational PBwikis are ad-free. We listened to educators and we recently made all educational wikis ad-free, so we want to spread the word about PBwiki.
Make a PBwiki as easily as a peanut butter sandwich. And as you know, setting up a PBwiki is free and takes only 10 seconds.
Check out the PBwiki tour!
Create your own wiki at http://www.pbwiki.com
Link to http://educators.pbwiki.com/PBwiki-educator-videos"

I have had good experiences with PBwikis; can be recommended.
Cheers,
Claus