Yep, about a year or so now. I tried the trial, then upgraded my Windows 2k licenses with my MSDN sub.
I wouldn't use it as a workstation OS...it's a memory hog and it's designed for server duties. Windows XP is truly the best solution for workstation and gaming, though WIN2K3 does support both.
Plus, given the abuse of workstation use you can bork even more with the server version. Turn it into a DHCP server, router, DNS server, and use it to control your network resources and security, but don't relegate it to workstation duties...you'll thank me in the long run.