The 80/20 Solution

I put this page together to play some games with the Google Ajax Feed API.Other ideas would be to integrate with Amazon XML (converting to Atom using my old template). It's pretty easy to refactor Google's example to handle an arbitrary number of feeds:

function initialize(feedUrl, elemid) {
 // populate element id=elemid with contents of feed
}
google.setOnLoadCallback(function() { initialize("http://del.icio.us/rss/gweakliem","delicious"); 
	     initialize("http://www.google.com/reader/public/atom/user/06963663178574458495/state/com.google/starred","googlereader"); } );

del.icio.us bookmarks

Google Reader Starred items

Data provided by Google Ajax Feed API