Originally Posted by: heknowsnothing
But I don't know if anybody else does this, but i find it easier to pick closer to the bridge when picking fast. Maybe a stupid thing to say.
Anyway, you can check out this site for exersizes i think.

Not stupid at all...the closer you pick near the bridge the tighter the string. The strings' vibration is smaller the closer you strike toward the bridge. So when you strike repeatedly you get a cleaner sound. Of course that doesn't mean you pick ALL the way near the bridge, just find a balance between sound and feel. This is true of fast strumming too. Where you pick/strum is one of the little subtleties that all great players use.