I'm fascinated by WCF and the abilities of the Service Bus. What interesting implementations have you seen ?
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This project allows several NAT'ed servers to access several NAT'ed clients across the internet over a single service bus connection.
It's a pretty smart implementation that will really get you thinking. Below is the source
... and another explanation of the same.
Also, there is a related project called "SocketShifter" on codeplex: http://socketshifter.codeplex.com/ Although the codeplex site advises using portbridge, I do see recent check ins (Aug 2010) and not sure which one is more up-to-date. It may be worth investigating.