Spotted the television ad for this one yesterday - it's a mini PMP called the VuGo, from Hasbro.

It's probably not something for the digital AV aficionado, but I bet a younger sibling would find it cool. Styled like a GameBoy Advance, the VuGo can playback music, movies, and pictures transferred through its USB connection. It also features one-touch recording from any video source; you can't really get much content on its built-in 128 MB memory, but you can expand that with the onboard SD slot (cards up to 2 GB are supported). 3 inch backlit screen and built-in speaker are decent. Battery life isn't great (3.5 hours for "content", 1 hour recording, on 3 AAA's), but at least it comes with an AC adaptor. Video downloads (cartoon shows, etc.) are available on the VuGo site for $ 1.99.