xbox 360

If memory serves it's 30fps, whether it's 60fields in SDTV or 30frames in HDTV and 480P. I don't think they'd be running at 24fps, but I don't know.

B3D has a nice review of the Xenos, you could check that.

I'm too sick to track it down.
 
If memory serves it's 30fps, whether it's 60fields in SDTV or 30frames in HDTV and 480P. I don't think they'd be running at 24fps, but I don't know.

B3D has a nice review of the Xenos, you could check that.

I'm too sick to track it down.

It can output to a number of frequencies. It can support "60fps" if you want to call it that, in progressive scan resolutions like 720p (aka 720p60) and 480p.

As for the framerates in games, a lot of developers are targetting 30fps. Epic is on record the Gears of War will be 30fps. If the framerate goes up (they were recently saying Xenos is better than expected) they will just add more effects. Ditto Silicon Knights who in their Too Human interviews is very bitter over the fact Eternal Darkness was locked in at 60fps and it did not help sales. Basically casual consumers look at screenshots and the nice bling bling sells.

Of course not all devs go this route. DoA4 is 60fps at 720p. CoD2 also is mostly 60fps. It is all up to the developer, their target, and how much time they spend on the game. But from a hardware perspective there is no limitation that says they cannot do 60fps other than time, skill, resources, and the work they are willing to put in.