Ok, I've put up a "sweeping guide" yesterday..I don't know if anyone seen it..But i wrote down whats most important how to "sweep" with the right hand and the rollover strings technic..
I compare this to doing pull offs/legato type of stuff the only difference is your pulling of the string and not letting it ring..same type of motion with the fingers..and its nothing hard about it really..whats hard is doing a sweep down and then go up again and repeating the pattern and still keep it clean..(now i'm talking about 5string sweeps like in my example!)
If anyone is really serious about learning sweeping i could try to have a sound conversation on msn or something and play and explain..

stripe_z@hotmail.com is my mail.

Cya