Ding Dong, WSDL is dead!!!!
Now that should get some people going... =)
Actually, I believe that, at least in its current incarnation. I'm sorry but I agree completly with Clemens, RPC is last year; enough already!!! Connecting two machines together directly (via HTTP, TCP, UDP, whatever) is brittle , and its time we changed our thinking.
I'm currently working in this space and I've been spending quite a bit of time attempting to decouple machine-2-machine communication via a MOM, dynamic discovery and selection, message filters; all that good stuff. The WSE stuff that NewIntelligence is doing is cool, but so is the WSIF project hosted by the Apache group (the inspiration for much of my current work).
[Currently Playing: Ministry - The Dark Side of the Spoon]