I've been playing a lot with [WCF] and [WF] in the past year, and these days mostly playing with both technologies and their integration features in Visual Studio 2008.
I've recently posted some getting started tutorials:
Yesterday, a new screencast was published about building WCF Services with WF in Visual Studio 2008. This 75 minutes screencast is given by Pravin Indurkar, the PM responsible for these features.
You can watch the screencast here.