Well, I thought that the looking at chips thing was going to be a great tell, but I honestly have caught no one in the games I've played doing this--and I have been looking for it, although I don't catch everything, of course.
Here are the few that I've seen that could have or have made me some money:
1) Players, particularly those in the "actors" group, moving chips out as if they're going to bet or call. These players actually usually do have weak hands and are ready to fold to my bet--good candidates for betting your AK unimproved or your raised JJ with an A on the board (actually had both of those situations late in the game tonight).
2) This tell is what I can really only call the "chemistry" tell, and it would have saved me some money a few nights ago had I paid attention to it. Basically, the player immediately to my left, who was kind of hard to watch closely due to proximity as well as angle, was obviously pretty excited about his hand PF (the "chemistry" part of it) and was himself ready to raise to $20 (2/5 blinds) when I raised before him to exactly that with AK. He just flat calls, as do several others. I bet out into the flop unimproved (mistake due to the tell--otherwise this guy is a fairly tight player), he raises, and I can fold to his QQ, which he showed.
Had I been REALLY on top of it, I had several options here. I could also have let him do the raising and given my AK some deception, although I'm not sure what it would buy me. It MIGHT have given me the option of check-raising a flop where I hit for some additional profit, but I don't know whether this player would have bet his QQ into a flop with an A or K anyway.
3) I'm still going to include the "are they going to play the hand" tell, although I can't say yet that I've gotten anything out of this tell, although I'm pretty decent at determining it. I think the main advantage on this one is figuring out raising quantities upfront if you have a strong hand. Wish I could read them well enough to determine whether or not they're going to raise PF (nice for the limp-re-raise on AA/KK for sure), but I'm not there yet.
More as a postscript: I actually think my "observing the players" rather than staring into space gets me MORE callers rather than less. Caro comments somewhere that most players are there to gamble and looking for an excuse to call. I almost think a truly (or semi-) challenging stare square in the eye is likely to get you MORE callers, and just the aimless "blank stare" is better if you really don't want a caller. I'll have to try a little bit of this, but I am very hesitant to do anything consistently on bluffs (for me, invariably semi-bluffs in the current game) vs. real hands.