I'm looking for a PDF app for the iPad that would allow me to make notes/annotations on PDFs, then transfer those files to a computer with the annotations intact, and be able to print/edit and retransfer them back to the iPad again.

Does anyone know of such an app? Do apps which let you annotate store the annotations in a format that's usable by standard full Acrobat on the Mac or is it some proprietary data that's only visible on the iPad itself?

Thanks.