I am using Panther 7B68, and I have to say that this version look extremely close to the final build. Every app. is in its final form (QuickTime, iTunes, Address Book, iChat, iCal, etc.). Also, nowhere in the readme, install, etc. does Apple mention this build being a beta release. The "Intro to Mac OS X" when you first install the OS is all new, and very cool. Let me know if you want any screenshots of anything. And yes, Panther is VERY fast.