I have just published a new project to CodePlex http://tfsalertsdsl.codeplex.com/.
Microsoft Team Foundation Server (TFS) provides an alerting model where given a certain condition, such as a check-in, work item edit or build completion, an email can be sent to an interest party or a call made to a SOAP based web service. Using this SOAP model it is possible to provide any bespoke operations you wish that are triggered by a change on the TFS server.
This framework is designed to ease the development of these bespoke SOAP wen services by providing helper methods for common XML processing steps and API operations such as calling back to the TFS server or accessing SMTP services.
They main differentiator of this project is that it also provides a Python based DSL that allows the actual operation performed when the endpoint is called to be edited without the need to to rebuild and redeploy the bespoke service. Operations are defined by script such as show below
For more details have a look at the project site, hope you find it useful