At the client I'm currently working with, we are waist deep in the WinFX pre-release cycle. Here is a quick list of download URLs for the tech stack that we're currently working with. Includes WCF & WF (and then those UI weenies are adding Atlas to the mix as well)

WinFX downloads -- February CTP

• WinFX Runtime Components
• Windows SDK (update - dead link, has probably been replaced with newer)
• Visual Studio Development Tools for WinFX
• Visual Studio Extensions for Workflow