I've always enjoyed watching close-up and card magic tricks. I've found a couple of interesting sites on the web, but videos (either on YouTube or elsewhere) remain a good resource for tips and tricks by both professional and amateur magicians. It's always interesting to watch someone perform a trick and then try to figure out how they might have done it.
To wit, witness the video below of Neil Patrick Harris (who's apparently an accomplished amateur) on Late Night with Jimmy Fallon:
It seems to me that Harris must be employing a card force, but exactly how does he do it? He fans the deck beforehand so he doesn't have a deck comprised of Aces. Is he taking from the bottom or top to give to Fallon? It's not obvious, but I don't see any other possibility.
This, to me, is the real fun in watching magic: driving yourself nuts trying to figure out how it's done!