Sometime next week I'm going to send out beta copies of an iPhone app I've been working on. If you'd like to help me out, please send me your iPhone UDID so I can prepare a copy of the app for you (this is required by Apple in order to let people install an app not in the App Store yet).
I would be especially grateful if you have an event coming up, such as a conference, music festival, or film festival. The application is an event scheduler/viewer. If you have such an event, I'll try to prepare a dataset just for you!
To get the UDID from your iPhone or iPod touch you can follow these instructions or download one of the many free UDID apps from the app store and SMS/email it to me. It would be great if you also let me know what type of device you have and what version of the iPhone OS you are running. It needs to be at least 3.0.