OEDB (Online Education Database) blog posting that reviews a number of mostly free Web 2.0 productivity apps. OEDB is a site where you can go to search for an online masters degree program.
This posting has the typical applications like Google Calendar, Zoho Projects, MyStickies, Google Docs, Bloglines, Google Reader and such. But it also includes a whole collection of useful apps that I have never seen including Chalksite, Schoopy, Gradefix and the like. The only problem I have with this list is the overcropping that they used with their logos. =-)
You can find this wonderful list at: Top 25 Web 2.0 Apps to Improve a Student's or Professor's Productivity