Importers 1.5 broken

The importers in the 1.5 source are broken. The .cs files are included, but they are not included in a project. Make will build them but Monodevelop won't. They also don't seem to work. As the folder importers do work I suspect that the ThreadPoolImportSource class is broken somehow.

I was writing an iTunes importer and it worked for 1.4.3 but with the new source some import-related stuff seems to be broken.