There's a nice in depth (as always) review of Panther by John Siracusa of Ars Technica,
Starting with Developer Preview 2, Ars Technica's Apple Technology Specialist John Siracusa has been following the steady progress of OS X from beta through Jaguar. Now Panther has hit the street, and John has undertaken his now-annual exercise of taking Apple's latest OS out for a long test drive. 
