As many others, for my personal machine I am going to upgrade to Windows 7. This machine is about 3 years old (Dell 9150) and runs XP pretty good - but I have to stay on top of virus blocking. Now when Vista came out I upgraded to that, but within a matter of months I reverted back to XP. My biggest gripe was the driver availability and the machine was kinda sluggish.
Well with Win7 I hope to do better and actually enjoy the new features and interface without complaint. I ordered Windows 7 Home Premium via Sams Club for $128 delivered to the door when it ships.