According to Net Applications' browser market share for December 2009, Google Chrome is #3 on the browser list.

December 2009 Browser Market Share

The data in itself is a remarkable accomplishment considered Chrome only entered the competition for browser market share about 16 months ago. However, I would suggest caution on the implication that Chrome has taken the #3 spot from Safari for the long term.

In December of 2009 Google released Chrome for Mac. This long anticipated launch conveniently pushed Chrome above Safari for this month. But we should use caution to declare Chrome the #3 browser based upon 1 month of data in the headlines of platform launch. It would be safe to say that a large section of Mac surfers use Safari and may have been test driving Chrome. I do see the climb of the Chrome market share as an imminent progression, especially with the announcement of Extensions in beta. But, I don't think we are there just yet.