Google Chrome

Chrome Extension Store
Gmail Extensions
Send from Gmail: Makes Gmail your default email application and provides a button to compose a Gmail message to quickly share a link via email
Mail Checker Plus: Displays the number of unread messages in your Gmail and Google Apps inbox. Preview mail, read, delete, archive and mark as spam!

Chrome Help Center
How To's
How to Import Safari Bookmarks into Chrome
Import Firefox or Internet Explorer Bookmarks into Chrome