Marketing Babble

Chromed Bird
Chromed Bird is a Twitter extension that allows you to follow your timelines and interact with your Twitter account.

Chromepad
A small extension that lets you to take quick notes and save them for later.

Google Mail Checker
Displays the number of unread messages in your Google Mail inbox. You can also click the button to open your inbox.

RSS Subscription Extension (by Google)
Adds one-click subscription to your toolbar.

Shareaholic for Google Chrome
Share, save or email any web page with your friends right from the page you are on using Twitter, Facebook, GMail, and many more!

I currently have all of these installed on my Chrome browser, but let me know if you find any I should add.