i am still having problems with connecting to my router as well. haven't figured it out. i am now on my second touch pro and still no wifi at home..... i have connected to a bunch of other networks... even the neighbors... but it will not connect to mine.
check out this thread..
http://forum.ppcgeeks.com/showthread.php?t=73696
what type of router do you have?
johnboyinfl