Free On-line Document Management Service

I've just discovered KnowledgeTree.com. It is a free Software as a Service (SaaS) document management capability. There are limits, of course, on how much you can upload and the free version is only good for up to 3 users, but for a simple home user, it seems to be a good resource. It certainly gives you a taste of what document management is about, why and how it can be very useful for any organization.