Work has begun on the solution persister. If anybody feels like helping out on the Visual Basic project persister part (which is non-existant today), just join here.
UPDATE: I seem to have failed to explain the purpose of this GDN Workspace, so let me retry. A while ago, I had a look at NAnt's solution task, Slingshot, #Develop's VS.NET solution importer and noticed all of them use pretty much their own way of scanning the VS.NET solution and projects. "Wouldn't it be nice if we had an object model to load and save those VS.NET .sln & .xxproj (similar to what the VS.NET Extensibility object DTE offers today)?", I thought to myself. It would allow you to build e.g. an automatic reference upgrader or a nant csc task sync tool or ...
I did some initial work on the project, put it in the fridge, and recently picked it up again. So there you have it.