I noticed major WiFi issues as soon as I upgraded to v3.1. iPhone would frequently (5 times/day) drop WiFi connection and keep asking for password everytime!
I fixed this by changing my router's Authentication Type from "WPA2 - PSK" to "WAP - PSK". WiFi is working great since.
Make sure to remove ("Forget this network") the connection, and restart your phone after you've made the above changes.
Source
Ofcourse this may not work for everyone, but it certainly did for me.
Orignal From: How-to: Fix iPhone OS 3.1 WiFi Issues ...
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