Airline Seating Charts, Best Seats
 

http://www.seatguru.com/
Heard this on the beat today

haha It is indeed a good site, I've been using seat guru for a number of years already. Possibly 3-4? But all the good seats are usually taken/given to club members of each airline. Like Cathay Pacific's Marco Polo club gets first priority in seat selection a few days before departure compared to Asia miles club members who get 48 hours prior to the flight. :)

This sites been around for years. They have other sites which are much better because they let you see seating maps, what seats are prebooked, how passengers will be on the flight, etc but you have to pay.