Chrome has quickly climbed up in the browser market share in the past year. Its at 10% already, way more than Opera, Safari etc. I guess 2010 is the year to watch out for, Chrome should become a major player now that extensions are available. Another interesting point to note is that it has almost exclusively eaten into the IE share of the pie.
Stats from:
http://www.w3schools.com/browsers/browsers_stats.asp