Google Chrome development lifecycle is like a fast paced car race. The builds are incremented every few months to mark major releases in the development and stable builds.
Google has just released Google Chrome 9 as the stable build to users, however, Chrome 9 which has already been in the beta channel for a while is going to be rolled out to users starting today.
Along with that, Google Chrome 11 is now available in the Canary build and will shortly make it to the development channel. This push will mean that Chrome 10 will make it to the beta channel.
Google Chrome 9 supports features such as cloud printing and background apps manager. This will allow Google to push their Cloud printing feature to a large number of users which has been rolled out to Gmail mobile recently.
Chrome 9 should be available as an update to regular users starting today. If you want to update your browser, head over to Settings -> About Google Chrome and let it check for updates.