StumbleUpon - allows you to discover and share great Web content matched to your personal preferences. Whether it's a website, video, picture, game, blog, or wiki, StumbleUpon helps you find interesting pages recommended by like-minded people with a single click of the Stumble button. After installing the plug-in, which adds a toolbar to your browser, you choose one or more topics of interest: astronomy, politics, television, and so on. Click the Stumble button and you're instantly delivered to a related site that others have given the thumbs-up. Likewise, when you "stumble upon" a site you like (*cough* Unlimited*cough), click the "I like it" button to share the page with others. The more sites you rate, the better your Stumbles will match your tastes. If you rate a site that isn't in the StumbleUpon database yet, you can enter some basic information about it so others can stumble onto it.
GMail Manager -allows you to manage multiple Gmail accounts and receive new mail notifications. Displays your account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.