The power of the Web: Here is a comment I received on my blog about wikis less than 24 hours after I had posted it :

David E. Weekly said...

Hi! I'd like to point out that PBwiki is free and ad-free for all educators. I'm really keen to know how we could help make the service easier to use, though! Please email me directly at david@pbwiki.com to let me know.

July 6, 2007 10:32 AM

I haven't written him back, yet. Next week!
-Valicia
Response from PBWiki:
Our support team will get the ads removed ASAP! [And they did - I have a pbwiki page and it looks beautiful!]
Can you think of 5 people we should talk to to spread the word about PBwiki? I'm thinking heads of associations, press contacts, or coordinators of educational conferences.
Thanks,
-Ramit
PBwiki Team


And from Wikispaces Teacher FAQ:

Back in January, we decided to offer our Plus Plan to K-12 teachers for free. We didn't set out with a grand strategy, just an interest in helping teachers with our easy to use wiki technology.

Over 10,000 educational wikis later, we've heard countless stories of excited students and empowered teachers. They've told us about their collaborative essays, group study guides, online lesson plans, and classroom notice boards coming alive on Wikispaces.

Now we're taking the next step - we want to give away 100,000 free K-12 Plus wikis. That includes all the features and benefits that normally cost $50/year - for free. No fine print, no usage limits, no advertising, no catches.

We hope that you'll read on, try a wiki at your school, and help us spread the word.

- Adam, Dom, and James

Update 8/6/2007:
I wrote to Wikispaces requesting upgrades/conversions of the wikis I have created - and was successful! Notice, this wikispace is now ad-free!
In addition, they added:

Check out http://www.wikispaces.com/help+Teachers for some teacher tips.
--Valicia




Some other interesting and pertinent wikis:
School 2.0
Classroom 2.0
Discovery 0607 on Internet Safety. Designed by Cresthill Middle School Language Arts teacher and edublogger, Ben Wilkoff