I have been experimenting with my feed along with my Yahoo Pipes and have created a couple of full-on feeds. One of these (RSS Feed) combines my site, Tumblr, Flickr, Google Shared Items and Twitter; and the other (RSS Feed) is exactly the same but without Twitter updates (you might, amazingly enough, not want to be bothered by my nonsense). Though I've been tempted to replace my main feed with one of these (the sans-Twitter one probably) - I haven't done yet.
I'm not sure how popular this might be but I'd certainly like to see a few people combine their myriad of sites/feeds into one easy to digest place.
Note
that I have changed the feed and RSS links to point to the Feedburner versions so I can more easily keep a track of them all. Feel free to visit the Pipes site though and clone them, but please use the Feedburner links if you plan to subscribe.
