might be interesting (from Weekly bookmark)
Blackboard.com is a free Web service enabling instructors to place course
work and grades as well as track participation and issue assignments - all
online. Students view assignments, submit work, send email, take tests and
chat in online study groups.
Submitted By: D. Swanson
Pronounced "key-uh", is short for Quintessential Instructional Archive a
site that "provides a variety of educational services, including: A
directory of thousands of online games and quizzes in over 40 subject areas;
Templates for creating eight different types of online games; tools for
creating online quizzes; quiz administration and reporting tools; and free
teacher home pages.