I installed iOS 5.0.1 today hoping beyond hope that it would fix my problem, but alas, not wifi fix for me. Have done everything anybody and everybody has recommended, even erased everything and reinstalled 5.0, etc. I can connect to any wifi but where I work. The IT people here took my iPad and couldn't figure out why it wouldn't connect. My wifes iPad is a mirror image of mine and I can connect with hers, but not mine.
The only thing I can think of is the night it quit working at work, I hit "forget this wireless (or whatever it says)". Since then I haven't been able to connect. I had been watching HBO GO and then at the end of an episode of Entourage, it just quit working. Like I said, I can connect everywhere else. McDonalds, my other jobs, home, etc. Just this one job.. Oh well I guess.
Hope 5.0.1 fixes everyone elses problems.