Age: 30
Location: Portland, Ore.
2006 Revenue: $50,000
Employees: 5
Year founded: 2005

After seeing the overflow of abandoned printouts while working at Ford, Hamilton decided a solution was needed. GreenPrint produces software that eliminates unnecessary text or pictures -- such as Internet ads or big photos -- from printouts, saving both ink and paper. Besides making less waste, it also saves money. "Ink is now one of the most costly liquids on the planet, about $10,000 per gallon," says Hamilton, whose product launched in December 2006.