When I'm reading an awesome post on the trending feed or shared by a friend (or anywhere else outside of my own subscriptions), I'd like to have a quick and easy way to subscribe to the posts' feed. It would be nice to have a subscribe button right next to the feed label, or at the bottom with the other buttons (star, mark unread, etc).

This would make it easier to discover new things to read and stay up to date, all within the comfort of The Old Reader!