My fiance and I both have HTC Arias. About two weeks ago, his wifi would no longer connect at his work or at mine; it still connects at home fine. (His work has a hidden SSID, mine and our house do not, all 3 connections are WEP-protected.) I've had no problem with mine in any of these places.
We've even tried rooting his phone and installing Cyanogenmod 7, to no avail. It still says scanning, once in a while will pop up that it sees the connection (and occasionally connects), but immediately loses it or disconnects. We're sitting in my office troubleshooting this morning, and I've tried setting specific channels on the router - I even temporarily left it as an open network, and it still could not see it or connect to it. We can stand right next to the router, and it sees nothing.
It's also not picking up any other connections, anywhere we go.