iPod touch Blocking regular sites?

I'm looking for a way to block just any ol' site on my iPod Touch, so filters for dirty sites unfortunately won't do (unless there's one that allows you to manually add sites to block).

Is it possible?

I found this old thread, and it seems similar to what I did on my own laptop (block sites through the hosts file--I love it), but I don't know how to add my iPod's MAC address to my router.

So I guess my official question is, does the above work and/or could someone explain to me how to add my MAC address to my router?

Hope this was clear enough; I'm hungry and all I can think about is food. Time to eat.

Thanks in advance for any help!