It's kind of inspiring that they keep innovating or at least try to innovate with such an old product. I wonder how many engineers they have working on Gmail, does anybody know this?
Also, GMail is becoming more than mail - it's becoming the new desktop, in a way - with integration into mail, chat, calendar, and tasks... What they're doing with widgets will significantly change things, also. For example, Twitter can be integrated in one of those chat-box-like views.