Heres whats cool about Wizag. The services semantic analysis pulls topics out of each post in the feeds you are subscribed to and lets you click to read all posts in your feeds related to the same topic. Most feed readers have a search function, but Wizag finds likely topics and lists the number of other items in subscriptions that discuss the same topic. Its a smart automation of possible searches before they are even performed.
You can tag, comment and vote on any item in your feeds. Its a shame that this metadata stays inside Wizag, but item ranking, or determining the order that items appear in your reader, is done through an algorithm that incorporates the click-throughs, votes, comments and subscriptions you and other users have gestured with.