One Number

Check GMail, Google Reader, Google Voice, and Google Wave. Four sources, one number. So you have your favorite "checker" extensions and you think that your Chrome toolbar is just a little too crowded, and you want to free up some of those buttons but you can't bear to sacrifice the functionality. One Number offers previews of unread items, a UI that fits with Chrome, the ability to selectively choose which services you want to check with One Number, and two-click access to open all services with unead items at once.

Requirements:

Google Chrome Beta Channel