I'll upgrade...
I currently have Panther. When Leopard comes out, I'll buy and install it. I used to follow an alternate release upgrade cycle since I didn't want to fork out the equivalent of $129 every year. But if
slows down their development cycle to (a new release every) 18-24 months like they are doing for Leopard, I might start upgrading with every release. 
I currently have Panther. When Leopard comes out, I'll buy and install it. I used to follow an alternate release upgrade cycle since I didn't want to fork out the equivalent of $129 every year. But if
