DAP Review has some more info about iRiver's new U10, which features a 2.2-inch colour LCD display and support for games. They have posted a couple of screenshots of U10 games:
Take a look at the linked collection below. You've got your variable pick of the litter - "Viva Flash Vegas" (fruit machine), "Log Jam" (guy running on a log), "Launch Fighters" (shoot 'em up), golf games, race games, soccer games (very clear what's going on in there, not) and stuff like Sodokus and card games... it's all possible.
Doesn't stop there, of course. If you really want to, you can check the amount of calories per Burger King/MacDonalds/Random Animal byproduct producing plant snack, have the Magic Eightball tell you what to expect, play the lottery or take a peek at London's subway map.