Actually, there is one answer that comes to my mind:
For all windows user, just simply try the Mac (at a shop or ask somebody who has one). After that, there are 3 possibilities:
1. You'll love it so much that you switch and never want to hear about Windows
2. You'll love it, but still want to keep your PC aside your (new

) Mac, to benefit from both platforms advantages
3. You just simply hate it and stick with the PC
Nr 2 is the way I've gone, and it works perfectly for me...but that's subjective.
@schweb:
I guess you're right about the "stupid thread" thing...sorry for that.
I guess I just read too much of those flames that started after similar questions. Because this always brings back those Mac users bashing PCs and vice versa...and THAT just simply IS stupid...