Expensive Tetris!
Indeed, especially when I still have an original gameboy and tetris.
It does get used for other games too, recently been playing through Day of the Tentacle and Indiana Jones and the fate of atlantis on Scummvm.
Expensive Tetris!
I'd actually get one if it had a little more RAM and could run windows (need something ultra portable for messing with ideas I have for whatever I'm programming when away from PC).
My Xperia X1 works for most of the other needs that this covers (aside from TV out and USB host) - can even boot some flavors of linux on it.