Managing a large number of RESX files

Question

I'm localizing a medium-size desktop app and am a little concerned about the large number of resource files and how to manage them. The solution contains some 300 RESX files that have to be translated to 7 languages, bringing the total number of RESX files to 2400. VS creates a separate RESX file of every single form and scatters them "all over the place", yet I can't find any tools either in VS or elsewhere to manage the resources. I'm using a thrid-party (one or several) localization company.

1) How do I easily extract the 300 default RESX files scattered across the 782 folders in my solution?
2) How do I copy the 2100 translated RESX files to the correct locations when I get them back from the translator?
3) How do I tag the resource files that have changed since the last translation?

I doubt that I'm the first struggling with these questions, so before I start to write tools for managing RESX files, I thought I'd ask around if anyone has a solution.

Thanks,
-- Rubio