Google's "Email 2.0" service, called Google Wave was announced back at the I/O conference, and has now entered a limited beta (in terms of number of people invited, no telling how long the service itself will be in beta).
Google Wave is an online tool for real-time communication and collaboration. A wave can be both a conversation and a document where people can discuss and work together using richly formatted text, photos, videos, maps, and more.
Since Steve Jobs probably isn't getting an invite anymore, if Google -- or anyone else -- has any to spare, please send them TiPb's way and we'll happily pick up the iPhone testing slack. (Shameless, yes. Joking, not one bit).