There are several sites which say they can take all your online content and aggregate it into one profile. I have tried out tumblr which many people swear by, but unfortunately it turned out to be something I would swear at, since it didn't work very well.
I've just gone back to Redgage. It's slightly slower, and doesn't take straight RSS feeds in, but on the other hand I have used it before and I know it works. My new profile is here: