A few days ago, I was trying to connect to my wireless Airport Extreme network with my iPod touch, and for whatever reason, the iPod could not find the network. Actually, it could find it, but I had to be right next to the router (and even then it only showed one bar of signal strength). After a little bit of digging, I solved the problem.

On your iPod, go to Settings, General, Reset, Reset Network Settings. Another thing I did, just for good measure, was erasing Safari’s cache. Sometimes it’s the simplest things that get me.

I hope this helps you.