Like every other publicly traded company, Apple Inc. is required to file a form 10-K with the U.S. Securities and Exchange Commission every three months. These typically contain some interesting bits of information that aren't necessarily revealed in press releases. Apple's most recent 10-K chronicles its unit sales and per-unit revenue for its just completed 2010 fiscal year.
Apple sold almost 13.7 million Macs in 2010, a 31 percent increase compared to 2009. Interestingly, portables (not including the iPad) accounted for almost two-thirds of that total. Nonetheless, desktops still grew faster than portables with