I tried it on my laptop: Vista, 8600M-GT graphics, 2G RAM, dualcore 2.4GHz, old video drivers.
It ran at 1440 x 900 (laptop native resolution) and while the framerate was kind of low, it was very playable, technically.
Unfortunately I failed to figure out how to play - I was completely baffled, fought the user interface and was entirely lost. So it succeeded in the 'not fun' objective for Beta-1 !