Harry Pierson has an interesting post that outlines how he learned to stop worrying and love WCF. In the post, Harry talks about the concerns that he's had regarding the lack of support for long running services in Indigo, and then discusses how a talk with Shy Cohen helped clarify some of the misunderstandings that he had. The primary of which, is that WCF's solution to long running services is Duplex Channel. In fact, Shy confirmed Harry's feelings that WCF doesn't have a real answer to long running services in v1.0.

I found the post particularly interesting since we've been talking about how best to support long running services within our application. One option that we've considered is Duplex Channels, however, we've had some concerns with whether or not the Security folks at our clients would be ok with us opening up a callback channel from the desktops running our software. At any rate I'm interested in what others think would be the "Reese's Peanut Butter Cup of service messaging". Harry's would be "something that has the programming semantics of SSB and the interoperability of WCF". And you?