After using Jaguar for a few days, (out of curiosity, I installed it from my Power Mac's Software Restore discs) I can definitely say that Tiger is a HUGE improvement over the previous versions of OS X, including Panther. It runs way faster and has way less bugs. I wonder why Apple never fixed the bug in the Panther finder where icons would change around after about a day of uptime? (example: a QuickTime movie would have a Real Player icon, etc.)