We are doing online backup and storage. We have an open source project (http://allmydata.org) that we are building a commercial product (http://allmydata.com) on top of. We have a fair amount of beta users (10K) and have our new architecture beta release due out mid-February. We will then be fixing any major issues, testing usability, and then going full release.

We've had good feedback from our users which has helped shape our usability and also which features were important to them (like having ftp access for example).

Hope this helps, Peter