well, let's see for how long anyone will be able to buy XP.

"Windows XP reaches its end of life on 30 June but Microsoft has now said it can continue being sold until June 2010 but only on cheap desktops."
http://news.bbc.co.uk/1/hi/technology/7435278.stm

I think if you already have a license you should be covered for longer than this, I assume.

I have Vista at work and XP at home, and though my work PC is meant to be faster and has all the new bells and whistles, the difference is not that great. And some of my everyday apps at work do not work as well as they used to. I noticed Adobe imageready CS gets stuck on network traffic a lot.
And like everyone else, I had to turn off about 95% of the security features to get it going properly, which is not a problem at work, since the network is secure. But I can see how this at home would be a more risky and confusing setup, I would have trouble coming up up with a working compromise between a secure and fully working environment.

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-'I curse the day my curiosity led me to investigate the strange stain inside
the atomic acelerator chamber'-
The Nuked Bug