After having a nice, white paperweight sitting in the closet for 5 months, it certainly didn't take us long to get the iBook back after the logic board replacement -- and it has worked flawless so far! We dropped the computer off at the Indianapolis Apple Store Friday afternoon and it was shipped to our front door by Tuesday -- yesterday -- morning. That's one full work day turnaround (did I mention it was free?) on an almost three-year old, out-of-warranty machine.
Of course, if I had just bought AppleCare in the first place it would have been fixed a long time ago...