I've found that other ipad 2 owners are experiencing the same issues as myself. I know it's not my network. My ps3, MacBook, iPhone, evo 4g etc all connect perfectly. This is very annoyng!!
Basically it drops signal frequently. Especially when resuming from sleep. Have two different routers. Sometimes it picks up both. Often times just one or the other. Even had trouble picking up a signal period. Like I said everything else works great. Freaking apple... Btw this is my second iPad 2 (first had a blown mic) and the problems are still here.