I updated my macbook to Snow Leopard tonight. I went to run my little C-type sizeof program, and found out that I hadn't recompiled it since I was running on a PPC. rosetta doesn't install by default in Snow Leopard. so I went to re-compile it only to find out gcc had gone missing. all I had to do was install the new XCode on the Snow Leopard DVD, and then download the iphone SDK 3.