web2+Wikis

Wikis are a type of free form database where people can quickly post information and respond to information. Documents can be attached to posts and shared with others. One of the interesting aspects of a wiki is that people can edit the material other people have posted. The wikis also maintain a history of changes and who made what changes when.

Free wiki service: http://www.wikispaces.com

Example wikis: [|http://www.wikipedia.org] http://kindermathtrails.wikispaces.com/ http://stacsmath.wikispaces.com/ http://math-link-list.wikispaces.com/page/xml/Primary+links?v=rss_2_0

Web2 - del.icio.us