Aggiorno is an add-in for Visual Studio 2005/2008 that can swallow horrible non-validating markup and help you make an ASP.NET site web standards compliant with little effort. With Aggiorno web developers can improve their ASP.NET or HTML sites by making them comply with the latest web standards and incorporating the latest technology trends. This will immediately mean increased productivity and immediate business value.
Beta 1 has just been released, so you might want to give it a try and send some suggestions to the development team.