Just had my first kernel panic under the WWDC Panther beta on my PowerBook G4/500. This is the first kernel panic I've had with OS X on any Mac since before 10.1 was released. To be honest, I cannot recall any kernel panics prior to the OS X beta program. So we're talking about two-and-half, three years? Contrast this with my XP-equipped Compaq Evo, which goes down about once every two weeks...