Great replacement for Google Reader - if it only added a pair of things Rated 4 out of 5 stars

This is one of the greatest RSS addons I've ever seen. Except it's missing a pair of things: if it only added the option to automatically share the favorited articles to a series of sites, and integrated a method to mark sites as read that were compatible with Firefox Sync (Sage, if I recall correctly, used the browsing history *hint hint*), then this would be THE free replacement for Google Reader.

This review is for a previous version of the add-on (1.5.4.1-signed).