Read 'em and Reap
Originally Posted by sindri_93
Havent read this and i also havent read Navaros(sp?) ReadŽem and weap(or something like that) but if heard Navaros book is much better and better suited to todays game.
by Joe Navarro - bajillion times better than Caro IMO, especially if most of what you're going to be playing is casino NLHE. I've read both multiple times.
As for keeping notes live, I don't think there's anywhere that has rules against it but you'll certainly draw attention to yourself and look like a bit of a tool.
The other thing about trying to keep "stats" live is that they'd almost always be over so small a sample that they'd be useless. Live, if you get dealt 30 hands an hour you're doing pretty well.
Think about that: how many hands do you normally want on someone online before you consider their stats to be reliable? And how long would it take to get that many live, assuming you even could?
Just concentrate on getting people's styles pegged (risk averse or risk affined, LAG, TAG), learn a bit about physical tells and pay attention to the betting patterns. That should be able to fill in all the gaps left by not having a HUD.