That's interesting. I also use a MAC whitelist, and I haven't been able to get my Touch working with my router yet, either.
In my case, the Touch claims it has connected but then just sits there indefinitely busy until I cancel it.
It's entirely possible that I don't have my router set up correctly, though. I didn't have DHCP set up until yesterday, and all my other wifi devices use manual settings. (I think I tested the DHCP successfully with my 3DS, but it might have cheated and used its existing settings.)
I'll give it a go without the Access Control list now.