SOAPy Mail (via Brett Morgan and Rebelutionary)
Kate Rhodes thinks an XML-RPC SMTP/POP3 implementation would be cool. My initial impression was, "Why not just use SMTP and POP3?" - HTTP is for sending Hypertext, not mail. Do we really want to be sending *everything* over port 80 in 5 years? To me, it seems like cramming stuff like email, etc, down the port that's mainly used for sending web pages goes against the idea of having separate ports for separate services.
But why the hell not? Even if it doesn't take off, it would be an interestesing proof-of-concept.
Perhaps instead of replacing SMTP and POP3 (or even IMAP), someone could write a frontend. The client could talk to the server using SOAP, and the server could still relay using SMTP. This would at least allow one to send mail to the rest of the net, and not have to be limited to servers who can talk web services at each other.
On a side note, I know Mozilla has XML-RPC client stuff built-in, and Brett claims that it also has SOAP capabilities. Which reminds me. Some day, be it in two weeks or in two years, I want to learn Mozilla's XUL stuff.