Hmmm. Well, I think the salutory lesson of this thread backs up my own personal experience, which is that XP is rubbish. I now have 2K Pro on my desktop at work and my home PC, and I absolutely love it. I would install it on my laptop (currently 98SE), but I like to be able to play games in hotel rooms!
It strikes me that the whole XP release (that's including Office XP) is seriously lacking in the quality control. All XP software is significantly less reliable than the 2000 releases, and that's before you take into account the fact that the 2000 platform is mature and stable.
MS will have to try quite hard to get me off my 2000 based systems.
Oh, and Deathhawk/Pako: You're right, Xerox paid for the initial development of the Mac OS, but then decided that they didn't want to go into the microcomputer business. There are also tales of workers who did things for $10,000 cash, instead of $10,000 in shares, which they could then have sold later for in excess of $1m. The genesis of Apple and the Macintosh is an interesting story.