Update: I have reached my quota; sorry I can’t help further (:
I tried iOS 5 beta on my iPad for a day, and it felt stable enough for daily usage.
I thought I should help some of my friends activate iOS 5 beta, since I am a fortunate iOS developer. If you do not know, an iOS developer can activate up to 100 devices (which I still can activate another 70).
As such, I would like to help any friends, or avid iPhone users, to install iOS 5 beta now, and not wait until Fall 2011.
All I ask for is a simple return: sign up for testflightapp, and be my app tester in the future.
After signing up, use your device to open up the welcome email from TestFlightApp. Login, and I will know your device UDID.
After that, I will activate your device, email to let you know, and you may follow these instructions to install iOS 5 beta.