Buy + read Mike Caro's book of poker tells
. He pretty much covers everything.
I think the biggest thing I could tell you without ranting is that strong means weak, and weak means strong.
For example, someone who throws their chips in the middle kind of forceably usually wants you to see his 'big scary' bet and is probably hoping you're going to fold. Conversely someone who just slips their chips in doesn't want you to even notice they're in the pot, and is probably trying to lure you into the pot.
Someone who stares you in the eye intimidatingly is again acting stronger than he is, and is probably trying to scare you out of the pot. Someone who's not even paying attention to the table might suddenly call a big bet without showing any apparent interest in the pot probably has a monster and again is trying to lure you in.
Keep in mind that the tougher players will mix up his tells, though. He might bet really strong and stare you dead in the eye when he's actually got a monster, just to confuse you. Tells generally apply to the newer players who aren't aware of them yet.