I know some of the following are x86, but I\'m pretty sure RasPi will be the next BIG thing on a global scale! Ports should come..
-XBMC (ported to arm beagle board)
-Puppy/DSL Linux (x86)
Feel free to let me know the second there\'s an ARM\'d puppy on the loose!! LOL
-AROS (was looking at this a few months ago before i ever heard of the RasPi. good call \"Beakster\" I would give it a try, It looks pretty good)
-Angstrom (spelling? sorry)
-DOS (yea yea, save the comments.. old school here)
-ReactOS (x86, ARM port just to give M$ a heart attack, I know the apps wont work)
-M$ WinBlows 8 (not!, however.. I\'ll take my skype any way i can get it)
Commercial companys could get a foot hold here, for example Breadbox Ensemble (formerly GEOS) with an arm port on SD for around $5usd could probobly revive that lost cause, call it GEOS 2 phoenix addition.
QNX always looked interesting.
I\'ll give any OS a try, who knows, there could be a better distro than Debian, but i doubt it....