Here are some new ones and a list of the older ones in case you missed them:

Interesting approach to giving students a reason to work on projects.
http://ali.apple.com/cbl/index.html

Web Gallery of Art
http://www.wga.hu/index.html

A Search Engine Interface for School
http://www.schoolr.com/

Still in beta, but coming soon from Ian Jukes and his group
http://www.21stcenturyfluency.com/

My Diigo Lists of LotW
http://www.diigo.com/list/kschaefer/lot_w

Technorati Tags: education, learning, LotW