If you want to learn the basics fast (the ABC's), look at Dime Casts, WCF.
Videos (around 10 minutes each)
- Introduction to WCF: Creating your first service
- Migrating from .asmx web services to WCF web services
- Learn how to consume a WCF service
- Taking a look at how to separate out your WCF service project into multiple parts
- Adding IoC support to your WCF Services
That means you can have a good idea within an hour :) Epic win
