Mac OS X install base grows to over 6% worldwide, 13% in the US

13% means 1 in 8 computers are made by Apple. How does that compare to HP, Dell, Lenovo, Asus, etc.?

It also means that for software and hardware developers, not supporting Mac means losing 13% of the total market. I imagine that to be higher (in creative markets) or lower (in enterprise markets) depending on the niche market.