By extension of my work, I can legally run a VL version at home on my main system.
What with the divison among Windows versions this time however, I may purchase an academic (which I'm also legally entitled to use) copy of Ultimate if it becomes available, since I may only be legally entitled to use Vista Business or Enterprise under our current license. I may also consider a Microsoft Action Pack if the price is right.
I just purchased an OEM copy of XP MCE for family I'm building a system for, with the Vista upgrade coupon. We'll see how the coupon goes, as I'll be interested to find out whether it entitles them to Vista Premium (likely) or Vista Ultimate (unlikely, or possibly with an upgrade charge). It cost the same as the licensed version without the coupon, so I figured it's at least worth the try.
Intel Q9450 @3.2GHz, Gigabyte GA EP45-UD3P, 4 x 2GB G.Skill @4-4-4-12
Antec P160SW case (modded), Xigmatek 750w PSU
3x 500GB (RAID-5), , OptiArc 7200S, ASUS E818A3T
Creative X-Fi XtremeGamer, Hauppauge HVR-1800, Radeon 4890