MailBrowser is a free Gmail Plugin that helps you easily manage your contacts and attachments .

MailBrowser makes Gmail and Google Apps more useful by offering a consolidated view of all your contacts and attachments in a browser sidebar. In this sidebar, you can quickly search for contacts, see the latest emails you received from a specific contact, add calendar events and attach notes and tags to a contact.

MailBrowser is currently available for Internet Explorer & Firefox. It works on Windows & Mac.