How do I enable folder sharing in Google Docs? Can I write my own program / application for this?
The best place to start is to go through the documentation . I would also recommend that you check out this video course (it shows you how to do this in PHP, but you should be able to replicate this to any other language you might be using). Good luck.
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I found a discussion on google (support forum, I would link if I had more than one / post)
At the bottom of the page there is a link to an app that supposedly uses the new API functions to implement folder sharing http://tng.appspot.com/2009/9/Folder-Sharing-in-Google-Docs-now-possible
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After reading my blog post mentioned by goorj, you can try the folder sharing app at
You will be prompted to log in with your google account and give permission to use your google docs permission. It works for regular google accounts, but not Google Apps accounts (but I'm working on that too ...)
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