Gmail has added Atom web feeds, a format that's akin to RSS. The feeds include a summary of each new message in your Google email. See screen grabs. In addition, the service rolled out a more robust contact interface that nicely lists all your contacts the related messages that live in your archive as well as the ability to forward your messages to any other email account.
UPDATED 10/5: Gmail announced new features, but Atom feeds were not listed. However they are still functional using Firefox Livemarks, provided you are logged in to your account.
