I recently published a free video on Ajax-enabling your WCF services.
This screencast guides the viewer through the process of Ajax-enabling your WCF services, allowing you to easily consume them from within your Ajax client pages.
Check out our growing collection of free .NET screencasts and videos. Subscribe to the Pluralsight feed to be notified when new screencasts are published. Also, check out our growing library of online .NET training courses — see what you can learn with Pluralsight On-Demand!