Tells

[quarkncover]

Betting speed is probably the most reliable tell online. Stay observant and pay attention. Fast bets usually tend to be very very weak or very strong. The long pause then check is tends to be weak. The long pause then bet tends to be a monster. This is not the case for many players though (particularly the multitabler.) In general look for inconsistencies in player's betting patterns and exploit that information.

Regarding live tells, I just stare into their souls and laugh. Seriously, I've found creating a friendly atmosphere at the table makes things much more profitable. I've found players having a good time are very easy to read.