If you're using OS X 10.5 Leopard without its new benefits such as Time Machine or Spaces you'll soon realize that it's nothing but a refurbished 10.4 Tiger with some minor touch ups.
Ever since I upgraded to OS X 10.5 my PowerBook G4 has been acting up. Some of the things I've noticed...
And another thing I've noticed, RSS feeds date is fixed to January 1, 2001! [link]
Even with all these problems my Mac still shines and can run for two more years without any trouble, hopefully.
Yet another thing to add to the list above... My RSS feeds screensaver died. Whenever I run it my Mac crashes. WTH is up with Leopard & PPC? :/