I saw this on the AirTran site and thought it was a pretty effective way of communicating - in a positive light - what type of seat you can choose for your flight. I can't say that I've ever seen an airline illustrate what seats actually look like, and frankly most seat selection tools seem to be oriented to the experienced traveler. Perhaps that's intentional, and I have no idea what percentage of people stay with their default assignment. The options for "sit together" and "leg room" seem useful ways to prod fliers into thinking ahead and selecting appropriate seats. I imagine this saves the airline a bundle in time savings not having counter personnel playing musical chairs before takeoff.