Hello,
Apparently Google has removed a limitation and it is now possible for all Google customers to upload "any file" to Google Docs. If you would like to try it, make sure you have the latest version 5.x or 6 (beta) from our web site.
Up until at least mid-2011, our Synchronizer could only upload converted files unless the customer had a Google Apps Premier account. Now this problem is completely gone.
That is really great news I think!
Cheers,
Tobias