I should add my name to the list, too.
After many years as primarily a Windows user, I decided towards the end of last year that I was going to switch to a Mac with a Mac Pro. But, I said I would wait for three things:
1) Vista to be released (to see the fallout from it, and I really wanted to use it in VMWare instead of XP). I was not wowed.
2) Leopard to be released - which at the time was expected to be June.
3) New Mac Pro hardware - I thought I'd wait past the first generation of Intel hardware, and again I was thinking this would happen at WWDC in June.
So, I thought I would have about a 6 month wait until June, which was fine, because I have a decent XP-based Athlon X2 system now. Had I known I would be waiting until November, I would have just bought last November when I first decided to switch and I could have enjoyed the system all this time. Argh!
But, after I had already waited until June, I decided to stick by my word and wait for my 3 conditions to be met. After all, I try to keep my word.
Now like many others I'm banking on new Mac Pro hardware shipping with Leopard, and if it happens, I'll be there as soon as it's announced.