Del.ici.ous or so

It was interesting to get to places that I never even knew existed and to be led there through MIT. I was surprised that people take the time to figure out how many brands are represented the Bourne Ultimatum - do I need to know this though? - and that you can look up seating options of the entire fleet of any airline. This seems to be a great service to people who travel frequently. I wonder who compiles such sites and what they get out of it.