Why? Do you think the average Window user is going to care about Tiger? As long as their system works *shrugs* They aren't going to give a crap about what you have. Hell most of the people I know who run Windows shrugs at Longhorn. The general sentiment being it will get here when it gets here. Only those who are Jihadish about an OS are going to give a crap. All you are going to do is come off as some immature jerk continuing the propagation of the Mac user stereotype. Joy.
Honestly though Tiger looks like a good OS. Nothing that I can't live without. To put it another way I can live without it until a REAL PowerBook revamp happens or Apple puts a GPU in the mini that supports all of Tiger's Core Image features. In the mean time I will deal with Windows as I have since Win3.11. Its an OS. Not a freaking religion.