For those looking for an app to track life, poison counters and anything else, I would highly recommend Scorekeeper XL. You can even use it for apps other than Magic. It's a really cool little app with really neat animations, and it's free for a limited time only. Grab it now!
Disclaimer: I'm not affiliated with the app in any way, but I just thought I'd pass on the good news.
- Tan Thor Jen