AFAIK, there are no games available for the iPod. About the only applications for the iPod are news/website readers and various hacks to display text. But nothing for gaming, sorry.
check out ipodlounge.com or ipodhacks.com for further info.
There was an April fools joke where a guy claimed that he ported Doom or was it Castle Wolfenstein to the iPod, complete with (fake) screenshots.