It seems a few people won't be happy until Apple make a super-games-machine for under $1k.
My guess is a lot more people would be happy with a less crippled Mac Mini. Something with a little more grunt and RAM-capacity, 7.2K HD and a decent-ish video card could have real appeal.
Same could be said for a more powerful iMac. I've mentioned a few times that a quad-core, dual-HD iMac with CardBus and a slightly better video card would have a lot of appeal for musicians, for example.
I'm missing a PCI slot and normal sized graphics card from my Cube.