As compiled by Professor Andrew Metrick, author of "Venture Capital and the Finance of Innovation," using his "own arbitrary and subjective criteria."
This list is as of 2006/2007, so I'm sure things have changed, although the very top few firms are probably still the same.
What additions/deletions would you make?
A Firms - The Top 6 in the World
Charles River Ventures
Kleiner Perkins Caufield & Byers
B Firms - The Next 9
Draper Fisher Jurvetson
New Enterprise Associates
Technology Crossover Ventures