Have you heard of Posterous? It's a blogging system built on the idea that you can just use email to write and submit what you want posted. It claims to handle images, sound, and video in a straightforward way, but I haven't tried that yet.
Email as interface suggests an interesting possibility. How often is it that I send you a link to something I think you'd find interesting? Pretty often, it's fair to say. There's nothing personal in these messages, normally, so they could actually be passed on to anyone at all. It seems that Posterous is perfect for this: send an email and CC the entire world by CCing a Posterous blog. You may have noticed that I did just that in this message; let's see how it works!