I read something about the idea of a so called lifestream in the adactio blog. Basically it is just a RSS Mashup with any feeds related to yourself. For example I have used some of my blogs and my del.ici.ous feed for it. And voliá, after a little bit of coding and a lot of css quirks my lifestream is now online.
To compare my work to others, you may have a look at the streams of Jeff Croft and Jeremy Keith.