I found this survey off of slashdot.org: http://www.macintouch.com/reliability/laptops.html.
The survey consists of Apple laptop users and reliability (how many times was it repaired, etc.).
I find the article of interest, due to the fact that I have already had to have the logic board replaced
on my new 15" Aluminum Powerbook, after only owning it for just a few months.