Using the site or the app is pretty straightforward... enter the airline, flight number, and date of your upcoming flight, and it'll give you seat recommendations. You can discover which seats have extended legroom, a power outlet, or if they have a restricted recline, like the seats in front of the exit rows. The app is a free download for most hand-held devices.
In addition, SeatGuru has all sorts of helpful articles about all aspects of flying... favorite airports, advice on electronics, airport guides, traveling with pets, best airport lounges, etc. And their new tool is very helpful: flight booking with built-in seat recommendations.
All in all, this is another great tool for making your travel plans easier.... and your flight more comfortable.