I'm seeing a lot of posts with people complaining about 10.6. I'm sorry but a lot of the bugs and problems people are mentioning just don't add up. That being said... If your having issues, perform a clean install. If you are planning on upgrading to Snow Leopard, perform a clean install. Basically... DO YOURSELF A FAVOR AND PERFORM A CLEAN INSTALL OF SNOW LEOPARD. DO NOT INSTALL OVER YOUR CURRENT OS INSTALLATION. Anyone computer guru will tell you a clean install is the only way to go. The only reason Apple probably includes the easy upgrade on top of current install feature is for marketing purposes.