That's actually pretty good for a company that ships high end or luxury computers.
..slips in the 4th Quarter mind you... but here's the article:
"Apple's share of the US computer market fell to 8 percent during the fourth calendar quarter of 2008 from 9.5 percent in the third as the Mac maker surrendered its third place ranking to surging netbook maker Acer, according to market research firm Gartner.
Preliminary data released by the firm Wednesday shows Mac growth to have slowed to 8.3 percent during the three-month period ending December, representing 1.225 million Macs shipped domestically. Apple has still gained a over a point in market share on a yearly basis, shipping 96,000 more systems than it did during the fourth quarter of 2007. However, its performance is down from quarter to quarter with 29.4 percent growth during the September quarter, when it reportedly shipped 1.645 million units to Americans."
Apple's share of the US PC Market in the 4th Quarter fo 2007 was actually 6.7%
"Apple does not rank amongst the top 5 PC vendors worldwide, and hence no data was reported for the company in the global demographic.
For the year, worldwide PC shipments totaled 302.2 million units, a 10.9 percent increase from 2007."