An in-depth post frrom Steve Hargadon, and as the creator of Classroom 2.0, SupportBlogging.com, and other communities, he's in a good position to speak from experience. :)
"Search the conversations of the Web": This is a simple and cool search tool put together by Steve Hargadon (founder of Classroom 2.0 and Support Blogging). It can be useful in tracking conversations on social networking sites (like ning), social microblogging sites (like Twitter), and others.
I also hadn't seen this until yesterday's workshop... it's a list of Social Networks created for educational purposes, not unlike the list of wikis at http://educationalwikis.wikispaces.com or the list of blogs at http://www.supportblogging.com.
Click in to find related links.