One solution is to use Google Docs and more, but to only store encrypted data there. This gets you the convenience of SaaS without the privacy issues (see http://rdist.root.org/2011/05/09/encrypted-google-docs-done-...).

Priv.ly has an interesting approach to this somewhat analogous to the above: http://www.kickstarter.com/projects/229630898/protect-your-c...

Tent is a protocol for distributed social networking that I'm very optimistic about. You can message me at https://elimisteve.tent.is (sign up at tent.is).