MacInTouch has released the results of their MacBook and MacBook Pro reliability survey, using data from over 3700 laptops . Among the findings:
* 22% of all MacBook and MacBook Pro computers in the survey required repair.
* 27% of the original Core Duo laptops were repaired by Apple
* 6.3% of the new Core 2 laptops have already needed repair.
* Batteries and Logic Boards were most often replaced
The results suggest that Apples first generation of Intel Core Duo hardware proved problematic, but it appears Apple has ironed out many of the kinks with the Core 2 Duo.
http://www.macintouch.com/reliability/macbooks2.html
http://www.appledefects.com/?p=202