iPod Touch WiFi Problems

"This seems to be a common problem (or at least it was in 2008) - see this thread.

One solution mentioned here is:

under your router settings make sure the encryption algorithm is TKIP.

I've found the same problem on another forum. In this case the solution was:

I changed a setting on the Trendnet so that it is using AES and the Preshared Key and that is now working. I sent an audio clip of my conversation with Apple support to the buzz email."