http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnglobspec/html/soap-over-udp.asp

Saw this coming out recently, i have been wondering why no such spec was available for a long time . With all the reliablilty and other features being built in at the application level  Soap over UDP should be a very viable option.
i strongly feel UDP is going to stage a comeback , richness epecially with the multicast option that it brings will find a lot of use