I have a benchmarking application and mathematical utility on the App Store called Gauge Mathematical Tool. I need a beta tester with an iPhone 3GS to test an update to my application. I only need to see the output of a test on your device, and it won't take much of your time. If you are interested in helping me, you can PM me your device UDID, and I'll send you an ad hoc build. Also, I'll give you a free copy of the version in the App Store, which will soon be updated to the version I'm testing (via a promo code). Thanks.