According to the context ( http://consumerist.com/210708/all-laptops-break-period ), this is apparently a graph from 2006 ranking "how quickly different laptops need repair," which doesn't really make a lot of sense given the way the graph is displayed. These definitely aren't the reliability scores from the 2006 rankings, which you can see discussed here: http://arstechnica.com/apple/news/2006/10/5614.ars
FWIW, the upcoming consumer reports rankings were announced yesterday, and all apple laptops topped the overall rankings:
http://apple20.blogs.fortune.cnn.com/2009/05/05/consumer-rep...
It's unclear where they are in the specific reliability rankings.
