Yup … and the Raspberry Pi website has a Debian image (amongst others) for download that uses the LXDE desktop environment.
I’m quite impressed by the Pi … but don’t expect it to be a cheap x86 PC replacement … or necessarily cheap, by the time you’ve bought a power supply, HDMI cable, keyboard and mouse, and either a compatible wireless card and powered hub, or homeplugs … unless of course your TV is right next to your router.
There is also a configurtion learning curve involved … but it’s well documented.
I’m also waiting to see what the Android ICS port that’s coming is like
Not quite sure why anyone would want to do that … Firefox OS is aimed at mobile (and presumably touchscreen) devices, the Pi isn’t exactly mobile ???
(unless you fancy lugging an LCD TV round with you)