We recently started the Connected .NET blog, where we’ll focus on the Windows Workflow Foundation (WF) and Windows Communication Foundation (WCF) pillars of the .NET Framework. You definitely want to follow this blog which targets to make content more discoverable and will be frequently updated by members of our product team with interesting news and tips. Two other great resources are our MSDN sites for WF and WCF which we recently relaunched. These portal-like sites will be frequently updated with fresh content based on your feedback.
Another great blog to keep in mind is from our colleague Keith Pijanowski who frequently blogs on SOA related issues and recently started a series on WF.