I'm wondering if anyone knows how you could do something like this site has.
If you don't want to login to see it, basically when you do a search and find a house you like you can "save" it to the side bar as a favorite. (It actually pops the image up and moves it over in a neat little animation... but that's not needed.)
So, is there a way to add an "add to favorites" or "add to lightbox" button under posts that, when someone clicks, it will add that post to that users "lightbox / favorites" area. Of course people would have to be registered on the site for this to happen.