While Hewlett-Packard may be known for product innovation, the company's corporate development is a tale of reinvention. HP provides enterprise and consumer customers a full range of high-tech equipment, including personal computers, servers, storage devices, printers, and networking equipment. Its software portfolio includes operating systems, print management tools, and OpenView, a suite that encompasses application, business, network infrastructure, and product lifecycle management. HP also boasts an IT service organization that is among the world's largest.

Apple Inc.

Computers are still an important part of its mix, but these days music-related products are at the top of Apple's playlist. The company scored a runaway hit with its digital music players (iPod) and online music store (iTunes). Apple's desktop and laptop computers -- all of which feature its OS X operating system -- include its Mac mini, iMac, and MacBook for the consumer and education markets, and more powerful Mac Pro and MacBook Pro for high-end consumers and professionals involved in design and publishing. Other products include mobile phones (iPhone), servers (Xserve), wireless networking equipment (Airport), and publishing and multimedia software. Its FileMaker subsidiary provides database software.