Yeah this is something i have been very interested in lately during live play as being able to read players lets you truly dominate and outplay people. A few players that i play with at a local game have a few tells that i have picked up on. One player when he has a monster pocket pair will often place chips on top of them as if to protect them from something happening, so that tell has often got me out of hands i would normally call his raise with. Another player always blinks constantly when he is bluffing
or betting into a hand he hasnt made yet (drawing hands) or just a weak pair that he knows are no good.
I also notice the way people put out chips is a huge one, e,g if they place the chips in a pile or splash them over the table often is a tell.
I just try to do everything the same at the table, like where i place my cards and hands during a hand and even count my breathing sometimes (to slow down when im in a big hand) and especially watch out how you put chips in the middle because that is a huge tell on alot of players.
I am no reading machine though, I am still trying everytime i play to improve that aspect of my game along with others.
Good luck though and im very interested in this thread.