David Tosh and Ben Werdmuller, the developers behind the educational social networking tool Elgg, will soon begin providing coverage of other educational technology products on their new blog, edufilter. From the blog's "About" page:

Edufilter has been set up as a resource for those wanting to find out more about the various educational projects going on around the world. As well as reviewing the projects we will be reviewing educational software.

(Read/Write Web has an excellent overview of Elgg and an interview with Tosh and Werdmuller here.)