What are you all planning to do once you get a copy of Snow Leopard in your hands? Will you upgrade from 10.5 and continue using your Mac as usual or will you do a format / clean install of Snow Leopard. I have been debating which is best. While I know you can easily install Snow Leopard on top of 10.5 and use your computer it seems to be inviting too many opportunities for wasted space and incompatibility. (i.e. think of the library and prefs files that wont work with 10.6. Wasted space, ugh). I still haven't sold myself on it being worth a format, re-backing up to Time Capsule, etc. What are you all planning to do??