This reminds me of one of the very first actions by Steve Jobs when he took over Apple again. He reduced the product line to 4 models, a portable and desktop version for consumer and pro markets. They have slowly added new model categories, but for the most part it is still iMac/Power Mac and Macbook/Macbook Pro.

(Then there are the iPod models, but those came later and is still only up to 4 models, and iPhone is one model with 2 configurations.)