Joukuu – Centralize, Share and Edit
http://www.joukuu.com/

Joukuu centralize all your backup files, share, edit and collaborate with friends and colleagues across multiple accounts. Currently supports Google Docs, Dropbox, box.net, Sugarsync, Huddle and Skydrive. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Entrepreneurial Resources Subject Tracer™ .