When I used XP I would format and reinstall XP at least 2 or 3 times a year to keep it running fast. Does the same hold true with UNIX systems like Leopard. Does installing lots of trial ware programs really slow it down? i am fighting the urge to reinstall Leopard and I know it is just a windows hold over urge but it is still there and strong. So I was wondering if there is a real benefit to a reinstall... thanks...