Join Date: Nov 2011
Posts: 6,168
Holdem Manager or Pokertracker.
They are stats software which provide a goldmine of information on your game and the villains you play against. They also provide you with a HUD when you play.
Google both if you're not aware of them, they both have free trials. Search on here and you'll find plenty of threads and info about them both. There's currently one on which is better - may be worth a read.
If you are looking to improve as a player then a program like this is a must have
