QUOTE
I don't think there's ever been an update that didn't cause problems for some one.
Wiser words were never spoken! 
I personally have have zero troubles with 10.4.8 on two Macs: One PPC and one Intel. In fact, I think the general feeling from users has been that 10.4.8 is the most stable 10.4.x release to date. FWIW, I always use software update and rarely repair permissions, but still don't have problems