I'm keeping track of all the stuff out there using FriendFeed. For now, it is the best service I found to do it.
The only feature I miss, I would like to have an action "Mark as seen" at the top of the page tab (next to the "Pause updates"). This way I could glance at it, mark them as seen (this could make them grey-ish) and later it would be easy to pick up where I left it.
Now where is the feature request button for FriendFeed?