So - what I learned from yesterday is that Steve Jobs reads my blog, and Apple Engineers are really, really fast :-).
OK - so just kidding, but I find the synchronicity amazing about the new "Spaces" feature in the upcoming Mac OS X 10.5 - Leopard. It's virtual desktops, done right on the mac. In fact, the marketing spiel is good enough that if you didn't grok how useful virtual desktops could be from my description yesterday, I suggest you go and watch the movie - it will give you a much better idea.
Still no indication that Vista will get virtual desktops yet, but I imagine people will be asking now that the mac has them (got to keep up with the Joneses). I did find another option for windows- Virtual Dimension after a quick look around yesterday. So far it seems to work OK (don't expect miracles, but it beats the pants off not having anything).
Anyway, I am very glad to see that my observations about virtual desktops appear to be bourne out by others (notably Apple and the many Apple users happy about spaces). I also note that the default number is four - no surprises there - it has always seemed like the natural number of virtual desktops to me.