Depends on what you play. I personally use poker edge, HOWEVER, do not install this software... do not search other people. Use it for yourself and only yourself. Poker edge is banned by both fulltilt and pokerstars
since it gives you an unfair advantage.
With that said though, you can search yourself and then you have the option to send an email to yourself with a full report on how you play. It gives you a lot of different stats on your playing style and where you need to either tighten up or loosen up, etc. If you have any questions feel free to ask.
Good luck on the felt