This looks really cool. Via Mashable, which has a good writeup:
Readburner is a site that has been playing at the edges of my feeds for several weeks now. I think I vaguely remember submitting my linkblog to a developer a month or so ago. He had said he needed a pile of linkblog submissions while he worked on an experimental aggregator based around Google’s Shared Item functionality. I saw a shared item in one or two of the linkblogs I subscribe to that ended up pointing back to a directory on an Amazon EC2 server.
Then Louis Gray wrote a couple articles, letting the cat out of the bag that there was indeed a project underway to finally fulfill the longstanding wishes of MG Siegler (and a great number of other folks like me who are avid Google Reader users). Yes, Virginia, there is a Google Shared Items memetracker, and its name is ReadBurner.