This, also to me, seems a little fishy. I doubt this repo is official. I'd like to see the dropbox staff to comment on this here.
Raphaël Hertzog is fairly well-known in the Debian community, and is a Debian developer. Note that its hosted on people.debian.org, which is an official Debian service for hosting Debian-related material from Debian developers.
See http://www.debian.org/doc/manuals/developers-reference/resou...
Also, see the new queue (linked in the blog post too) http://ftp-master.debian.org/new.html where you can see Raphaël has uploaded it to the official archive. Or the details here: http://ftp-master.debian.org/new/nautilus-dropbox_0.6.7-1.ht...