Taken from: http://www.google.com/ventures/
Google Ventures seeks to discover and grow great companies - we believe in the power of entrepreneurs to do amazing things. We're studying a broad range of industries, including consumer Internet, software, hardware, clean-tech, bio-tech and health care. We invest anywhere from seed to mezzanine stage and embrace the challenge of helping young companies grow from the garage to global relevance.
From the FAQ at:http://www.google.com/ventures/faq.html
How much capital does Google Ventures invest?
We're able to invest amounts ranging from seed funding to tens of millions of dollars, depending on the stage of the opportunity and the company's need for capital.