I run XP Pro 64 bit and XP Pro 32 bit. 
I've tried Vista RC1, the 64 bit version. An abundance of graphical goodies, and I couldn't find anything. Made my PC feel like a Mac.

I'll probably upgrade my 64 bit workstations to WinXP 64 bit in the near future. Sleek, fast, no unnecessary junk. I want those CPU cycles for rendering! No Vista for me.

Security? No problem. Anyone trying to get into my home network first needs to pass the firewall in my broadband router (not easy), then it'll have to pass a locked down 2003 Server (also not easy), before he finally can enter my workstations. And I monitor those, I know each and every process that SHOULD run on the machine.

My log files show regular automated attacks over the years. None of them has ever gotten through. 

Support? Microsoft will continue to support WinXP for several years to come. Which is FAR better than ANY other software company I have ever dealt with. 
Poser 7 has been released - no more updates for Poser 6. Vue 6 has been released - no more updates for Vue 5. This is the usual update policy of almost all software companies.

DRM: No, I don't like it. I don't like it at all. Neither do the Microsoft engineers. They wouldn't have implemented it if they had not been forced to do so by the music and movies industry.
Linux does not have DRM. And if I read the signs right, new versions of Linux will be required to have the same DRM crap as Vista (and Mac OSX next version). By law. Legislature bought by the film and music industry.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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