From WindowsWorkflow.Net:
Windows Workflow Foundation Beta 2.2 is now available for download on MSDN at this location. Please note that this release is not compatible with the February CTP of WinFx and must be installed on a machine without the February CTP. For more details, please refer to the installation instructions. While this installation is marked as the "Microsoft Visual Studio 2005 Extensions for Windows Workflow Foundation Beta 2.2", it contains the runtime and documentation components as well.
Hmm... I hope this doesn't mean I have to flatten everything and start over just to install this update. However, this is exciting since it should include the ASP.Net asynchronous background workflow support I was looking for.
Update: You can upgrade to this version by following the instructions. However, I misread Paul's post about "functionality was added after beta 2.2 was released" [emphasis mine]. I read that and thought it was going to be in 2.2. :)
Update2: I don't know why this suddenly appeared as new to me when it has been out for quite some time! For some reason when I went to the homepage it looked different so I thought it was a newer release. I guess I have to have a good laugh at my own expense from time to time. :)