Hey all, I'm on version 10.5.8 with a Macbook Pro from last year. I have recently been viewing and practicing iPhone application programming but cannot find a way to get the new SDK for Leopard. I am thinking about upgrading, now if I upgrade, does the software format my hard drive or no? And what are the advantages of Snow Leopard, I didn't upgrade earlier because my friend's Mac had it and he said he felt as it froze more often than Leopard.. mind you this was last October-ish. Any thoughts?