Google Chrome: Nearly 2 million US downloads in first week
Of course, installing isn't necessarily the same as using. I'm fairly certain that a hefty number of people who installed Google Chrome were doing so just to check it out. Many probably played around with it for a few minutes and then ditched it to go back to Firefox, Internet Explorer, Opera, Safari, or whatever it is they used.
In other Chrome news, Google seems to have issued an update to the browser today. If you click the "about" button in the browser, a message will pop up telling you that an update is available. I have yet to find a changelog showing what's new in version 0.2.149.30. I'm guessing mostly bug fixes.