Search capability for past feed items
One feature I enjoy about Google Reader is the ability to search past feed items from a long time ago, such that they might not still be in the actual rss feed. This makes it easy to share an article with a friend if it comes up in conversation a month later, or if I remember seeing a past article but can't remember where I saw it.

Great idea. We are planning to integrate Google’s AJAX Feed API and I am sure this will enable such search. Will take a while though. Thanks.