Strengths and difficulties:


Web sites of interest
Davidson WebPhysics (Physlets, examples)
    http://webphysics.davidson.edu/
Myself (additional examples, links)
    http://www4.ncsu.edu/~swbonham/
WebAssign
    http://WebAssign.net/
SCALE-UP
    http://pcep.physics.ncsu.edu/SCALE-UP/
NCSU Physics Education (link to this presentation)
    http://www.ncsu.edu/PER/