I've been using this app for about 2 years now and I'd thought i'd share it with you guys as it has improved my game tremendously. I like how it has a social element where you see how your poker buddies are doing. It's $12.99 but IMO it's well worth the investment.

Link to iTunes:
Download Here

Poker Track Pro (iPhone)

App features:
* Record games with a touch of a button.
* Built in timer for game length
* Stats, graphs and reports on multiple categories
* Custom programmable filters
* Import and Export data when you change phones
* Import Poker Journal stats
* Import Poker Income stats
* Email your stats in an excel document
* GPS locator for defaulting your current location
* Odds calculator
* Record Big Hands
* Track friend's games in real time
* Global casino Locator
* Player Tracker

What poker related apps do you have in your arsenal?