Alright, here's the deal... This WILL work, if you have the Wifi switch ON. If it's turned off / stuck off, it won't help you. It's worth a try though if you can still turn the switch on/off.
--------------------------
http://forum.xda-developers.com/showthread.php?t=320239
Download the program in that thread (you have to register if you haven't already), then read the 4th post for a registry edit...
http://forum.xda-developers.com/show...97&postcount=4
Once you have those done, you can control Wifi through the Comm Manager.
Here's a few skins as well made by a member here. You'll notice he's also got the registry hack on his page.
http://forum.ppcgeeks.com/showthread.php?t=16282