Ok, so lets say you want to keep Google Reader as your back end, but want a new front end (ala the various apps on iOS). Is there a good alternative online fr

Ok, so lets say you want to keep Google Reader as your back end, but want a new front end (ala the various apps on iOS). Is there a good alternative online front end (open source or paid) that can replace Google's front end, but still offers things like "mark unread"?