No particular reason... I'm just interested really... (curse my endless curiousity...lol!)

I've got:

Windows XP x 2
Ubuntu x 1
Puppy Linux x 1 to play around with running from a USB stick on an old thin client machine
Win 2K x 1 as a legacy machine
Irix 6.5 on SGI 02 workstation as a historical curiousity


I thought of doing a poll but it would be too complex to specify the options!