Like to catch big air? Then you'll like the new HangTimer app for iPhone, which measures your, um, hang time. As the site says:

HangTimer uses the iPhone's accelerometer and some hairy math to determine the split second you become airborne. The HangTimer works on kickers drops even rollercoaster’s!

As an extra bonus for iPhone 3G users, Hangtimer uses the phone's built in GPS to find your exact position for every jump and plots it using Google Maps. The GPS also enables the HangTimer application to display the user's speed as he or she cruises along and how fast they are going when they take flight. All this information is saved for display on a "sweet graph" that allows them to later check out their entire run and see where they caught the biggest air and fastest speed. In other words, earn bragging rights.

Created for both versions of the iPhone and iPod touch, it also keeps a record of the user's 10 best jumps. Through partnership with Snowcountry (the largest ski resort database in the world),it can also automatically locate your ski resort and download trail maps, lift status and snow reports – all through one application.

$9.99 at the Apple App store.