DockStar

DockStar is the ingenious way to keep an eye on your Mail. Add new badges to the Mail dock icon and clickable indicators to the menu bar. DockStar lets you keep track of email in various accounts and folders, RSS feeds, Notes, and To Do items with customizable badges in the Mail icon, menu bar, Dashboard, and even in a screen saver.
Power-users can't live without DockStar to keep tabs on their many folders and accounts.