Personally I'd look at going to networking events and checking out mailing lists for co-working spaces. I'll give a spin and a mention to the people I know.
Edit: Just gave it a spin. I can't seem to find a way to share the folder that Site44 has created. This is pretty much the key to it all as it allows people to collaborate on things.
Thanks for the tips, and thanks for helping to spread the word.
Yes, it makes us very sad that you can't share app folders. Dropbox tells us it's an implementation limitation that's not likely to change soon. :-( An alternative for us would be to skip the Apps folder and go for full access to your Dropbox, but in terms of privacy, we don't really want that access. We like being sandboxed in the Apps folder, but it does mean folders can't be shared.
Edit: Just gave it a spin. I can't seem to find a way to share the folder that Site44 has created. This is pretty much the key to it all as it allows people to collaborate on things.