As mentioned in the last post, it is possible to implement a custom service applications in SharePoint 2010. Here is a diagram from the SharePoint Conference, showing the components consisted in a custom service applications:
Based on the above diagram, knowledge on WCF services and the new PowerShell Cmdlets is required to build a custom service applications. Unfortunately I have not got a chance to play with WCF yet. Fortunately this is a good change for me to start learning this technology which was introduced in .NET 3.0. So if you are new to WCF, and you would like to create a custom service application, we are on the same boat.
In the next few posts, I will blog about my experience in building a custom service application in SharePoint 2010, including building a simple WCF service and hosting it in IIS.