I've got a 15" Ti PowerBook and decided to upgraded to Tiger today and so far it's been stable and no real problems. The only complaint I have so far is that the fan runs FAR MORE than before. I'll be browsing sites and about 10-15 minutes in and the fan comes on and won't shut off. The fan has been running for a long time and I never used to have this problem before. Is anyone else having a problem with the fans running constantly?