posted message: Since I read Anya's book, I've found Openstudy, and got addicted to it:
http://openstudy.com/users/linjaaho
I like to help students with questions on electrical engineering. This was my favourite:
http://openstudy.com/groups/physics#/groups/physics/updates/4e5e468f0b8b1f45b4986ef2
Now, next thing to try out from the book is P2PU. I like the user interface of P2PU, and I'm very enthusiastic to find out if this is a great concept. If Openstudy works, why wouldn't P2PU?