Obvious I know, but check the WPA key is the same between the laptop and the ipod.
Jailbreaking shouldn't affect it if he used blackra1n on 3.0/3.1, but doing a "Reset Wireless Settings" couldn't hurt.
Did you enable anything like MAC Address filtering on the router? If it's enabled, you might have to get the MAC address of the iPod and enter in so the router can be accessed.
Just a couple of ideas. HTH.
DJS.