Certainly looks promising. For some reason it reminds me of Portable Apps.
As for Dropbox, yes, I recently went through installing it. Terrible experience on Ubuntu. I think the reason is mostly that it is using a proprietary daemon. A FUSE driver seems like a much better idea, and if they released it under an open license, it would be as easy as apt-get install dropbox.
I tried to set up Dropbox without any sort of a GUI. I know that their .deb package is partially an extension to Nautilus, and since I run Xubuntu I don't have that installed. Instead I followed the poorly written instructions at http://wiki.dropbox.com/TipsAndTricks/TextBasedLinuxInstall which resulted in a .py file being invoked via ~/.profile which still creates a GUI window to ask you for your information, etc. Why not have a standard daemon with a ready-made init.d script rather than this madness?
As for Dropbox, yes, I recently went through installing it. Terrible experience on Ubuntu. I think the reason is mostly that it is using a proprietary daemon. A FUSE driver seems like a much better idea, and if they released it under an open license, it would be as easy as apt-get install dropbox.