WeCollaborate.com is built on the Ning.com platform, and one of the apps that can be added is for the Box.net service.  Box.net has a free/personal plan that allows up to 5GB of storage.  So, I added this feature and am interested in seeing how it works for you. Hover your mouse over "Members" and click on "Repositories."  I think Box.net will allow you to sign up, and then be able to create fold…