Excel nerds rejoice! What you see above is the result of a laptop reliability study conducted by third-party warranty shop Squaretrade. The study looks at over 30,000 notebooks over the course of 3 years to determine the final reliability statistics. The results may not surprise you; for instance, netbooks fail 40% more often than premium laptops and Apple's MacBook line has above-average reliability.
The report itself is fascinating to read and the graphs are simple to understand. Also, it is nice to see an independent study confirm what I've known for years: HP makes low quality laptops. A note of personal interest, had I purchased a Vaio all those years ago rather than a Presario, I might never have switched to Mac.