I'm not sure I understand why you describe Dropbox as one-way. If you
share a folder with someone, it appears in both of your Dropboxes and
any changes people make to the contents is shared with everyone. It
worked quite well with a 3-party project I was working on recently.
Mea culpa - I confused Dropbox with a different file sharing service.
Dropbox is the best solution I've encountered so far, hampered only by the problems that people have to sign up for the service (not a big issue), that they have to install software on their machine (possibly a problem), or finally that some institutes block access to Dropbox or have firewalls to route around. That's why I was hoping there was a website solution that would solve the last two points.
I'm sorry if I'm missing something here, but wouldn't Google Docs or
Zoho fix this problem? I use Docs to collaboratively write articles
and proposals with my students and it works like a charm.
Pardon me if i am missing something, but Google docs (docs.google.com) seems
to do this very well.
Do Google docs / Zoho work with arbitrary file types? (Word files and Endnote are obviously a minimum but we have specialised data formats al the time.) And you can have finely controlled access to docs?