Mike Taulty has put together several excellent short WF videos (nuggets). I hope he creates a series of WCF and WPF nuggets too!

Here's the list and the suggested running order:

01 Workflow Foundation Hello World Watch Download

02 Dealing with Exceptions Watch Download

03 Conditional Logic Watch Download

04 The Conditioned Activity Group Watch Download

05 Working in Parallel Watch Download

06 Dealing with Cancellation Watch Download

07 Listening for Events Watch Download

08 Passing Parameters to Workflow Watch Download

09 Working with Transactions Watch Download

10 Communications from Workflow to Host Watch Download

11 Communications from Host to Workflow Watch Download

12 Bidirectional Communications (Host <-> Workflow) Watch Download

13 State Machine Workflows Watch Download

14 Building a Simple Workflow Activity Watch Download

15 Building Declarative Workflows Watch Download

16 Modifying Workflows whilst Running Watch Download

17 Using a Persistence Service Watch Download

18 Building a Persistence Service Watch Download

19 Using a Tracking Service Watch Download

20 Building a Tracking Service Watch Download

21 Using a Scheduling Service Watch Download

22 Building a Scheduling Service Watch Download

23 Calling a Web Service from a Workflow Watch Download

24 Using the Synchronization Activity Watch Download