More Leopard
I've enabled Time Machine. It took a few hours to back up 70GB or so to an external disk. It didn't back up the Windows XP partition; I'm not sure I approve but considering that as a separate machine and therefore organizing backups of some form separately is not something that actually bothers me that much.
Not much more to say about it at this point; it's rather in the nature of backups that you don't just enable them and know all you need to know...