Good to read Apple is taking fixing Tiger seriously.
It's a disgrace that Apple released Tiger when they did. This obviously proves out the point that Tiger _really_ needed another six months of development.
Anyway, I hope Apple doesn't pull this crap with 10.5, and the feature improvements are significant. Longhorn is shaping up to be one hell of an operating system. (And yes, we can complain it is simply a rip-off of OSX, but companies and consumers could care less.)
Apple needs to get 10.4 working right since it is the ethical thing to do for people who paid for the upgrade, and then move on to ensuring that 10.5 leap-frogs Microsoft and changes the game.