NodeICO (GitHub: rvagg / nodei.co, License: MIT +no-false-attribs) is an open source service that displays badges for Node modules. As an example, this is what the Express badge looks like:
There's also a cool graph version:
The project was written by Rod Vagg and uses restify.
Speaking of restify, Kent Safranski sent in Node-FSAPI (GitHub: Fluidbyte / Node-FSAPI), which is a project to provide a RESTful server for interacting with remote file systems. It supports three layers of security: URL keys, IP restriction, and HTTPS.
The client implementation supports Ajax, so from what I can tell you could use it as a browser-based solution for storing files.