I heard on good advice from a pro Mac user that the 10.6.2 update is where to chime in on SL if you haven't purchased or installed it already. I will tell you that I use Leopard on one machine now and Tiger on another and have no desire to upgrade to something with this many problems, just to say I have the latest OSX running. I do like to keep up, but when I talk to a pro that knows what he is talking about and has a website completely dedicated to helping you get he most from your mac, with daily updates and reviews, and replies to emails that he normally charges for in consulting, I listen. Well, even when 10.6.2 comes out, I doubt I will upgrade unless an upgrade will speed up my machine 15% or more just by installing. Oh, I already have the max RAM on my machines.