Così Raffaele può iniziare a buttare via un po' di VM con
la beta2 
We released Windows Workflow Foundation Beta 1.2 today. As described on the download page, this release is primarily as a pre-requisite for certain parts of Office "12" beta 1. In terms of functionality there's no difference between Beta 1 and Beta 1.2 but they require different versions of the .NET Framework.
- Windows Workflow Foundation Beta 1 requires the .NET
Framework 2.0 Beta 2
- Windows Workflow Foundation Beta 1.2 requires the .NET Framework 2.0 RTM
The upside is if you now have Visual Studio 2005 RTM you can use this download to try out Windows Workflow Foundation Beta 1. Also with this release you can see the workflow runtime is separated from the SDK and tools in two downloads.
Fonte: Windows Workflow Foundation Beta 1 for Visual Studio 2005 RTM