I blogged about removing a test case before. I suggested to use the power tools to remove the work item. I found out today that in Visual Studio 2010 this is no longer needed. You can use witadmin provided you’ve admin permissions. witadmin is a command-line utility and is located in %Program Files%\Microsoft Visual Studio 10.0\Common7\IDE.
A sample how to use this command:
1: witadmin destroywi /collection:COLLECTIONURL /id:10