Apple has updated a Knowledge Base article that addresses Wi-Fi connectivity issues. The revised article offers a number of different solutions including a future software update.
We originally reported that iPad users were having WiFi issues shortly 
after the device was released. That was after a number of users were posting about their WiFi problems on Apples forum. Apple claims this is only effecting a very small number of iPad users. We have not experienced any WiFi problems with the iPad so far.
[poll id="2"]
I have lost wifi since upgrading to IOS 4.3.3 on iPad 2.