Custom WCF Service for SharePoint 2010
Its easier to implement a custom WCF service application for SharePoint 2010. At least its no longer required to create HTTP Module to make SharePoint understand what to do with a file with .svc extension, as we used to do with SharePoint 2007. I recorded a demonstration I delivered to one of our partners showing how to deploy custom WCF service application for SharePoint 2010. Here is the link to download the recording and the code.