Finding Cheap Flights and Good Airplane Seats

This site has a really good interface for finding the cheapest flights between two cities:

http://www.itn.net

Although it is run by American Express, the site accepts other credit cards, too. Just click on the "Search all dates for best prices" button and you can enter a range of months to be searched.

Once you have an itinerary, this site will help you pick your seats:

http://www.seatguru.com/

If you place your cursor over a particular seat, it will tell you any special characteristics of that seat (extra legroom, limited recline, evacuation slide takes up legroom, etc.). Also pay attention to any notes at the top of their pages.