Seems like an interesting idea. Personally, I think an apt-get style of package management would work better for Pd. Sounds like you have all the right infrastructure, but instead of auto-downloading patches, it could be used for package management.
True. I don't know though, I don't have a good concept of how that might work for Pd. It's been discussed before but no one's really come up with a concrete suggestion for it as far as I know, so this is the best I could come up with for now..
I thought it might be good to get the ball rolling with some code. I'd be extremely happy if someone wanted to fork it into a package management system. At least it demonstrates how to download files, check them for trust, and tell Pd to load them, so maybe someone will find a better way to use that. As it stands, the code is good enough that you could publish a patch on your website that would download the rest of itself on the fly, so it's a start at least.
Steve