My PB was stuck at the Aquiring IP Address screen, as well as at the other screens for aquiring wifi stuff, and it wouldn't connect to the networks that it could find.
One router I reset, and then I could connect, but it's multiple networks that I can't connect to, so I'm thinking it's a PB issue.
Also my battery drain is ridiculous right now, but that's for another thread.
Try a restart. Battery - are you using native email and if so, did you set any for Manual retrieval - that can be a problem (bug).
First try: First, press and hold the Power button for 10-15 seconds. Then leave it for 20-30 seconds and see if it restarts.
To REBOOT:
Press and HOLD all three keys for about 10 - 20 seconds: PowerOn, VolUp and VolDown. Start with the PowerButton. Keep holding past the 3-choice options screen. If you hear a shutter type sound, you've taken a Screen Shot and probably missed the PowerButton.