Sitting in a Don Box session at the moment looking at some future stuff for how WWF and WCF will talk together.

Very cool concepts- theability to simply have a workflow be an Indigo service but they really tightly integrated the two.... which is great.

For example if you have a correlated receive and send pair or activities in your workflow when exported as an Indigo service they will be matched up as a Send/Receive pair..... This also means that we can model contracts more richly than just single pairs- we can model contracts as conversations- i.e. we know the order in which our workflow expects to recieve messages.

Looks great. One thing that I'm interested in is just how much hosting support they're going to give us for Indigo Workflows. I'm pretty sure that IIS is going to be an out of the box supported hosting mechanism (hosting session is next).... will be interesting to see what sort of higher end support services we get OOB... things like persistence services and so forth to enable long running work flows.