Well, I tried the Live CD of the 32bit version last night, & it was definitely... Linuxy.

Had a bit of a fiddle with various things, & discovered that Solitaire is just as addictive on Linux.

Wasn't able to change to 1024x768 [it defaulted to 1280x1024], presumably because you can't use the restricted ATI drivers unless you're running Linux from the HDD instead of a Live CD [installation of them required a reboot]. I did try to change the resolution to 1024x768, but ended up with a grey background & an X shaped cursor, & nothing else. Fortunately it asked if I wanted to keep those settings & I said no, & it reverted back to the way it was before.
I think I may actually install it on a partition somewhere, but before that I need to shuffle some stuff around, & also want to have a go at XP 64.
As for installing Ubuntu, what's the safest method? Should I create some unformatted partitions with Partition Manager 7 in Windows & then just tell Ubuntu to use them [the last time I tried installing Linux it wanted 3 partitions], or just leave some empty unpartitioned space & tell Ubuntu's setup to use that?