Does anyone know how to find really cheap flights from boston to houston?

Airfare Predictor:

http://www.farecast.com/

Airfare Alerter:

http://www.airfarewatchdog.com/

Booking Engines:

http://www.travelocity.com/

http://www.orbitz.com/

http://www.expedia.com/

http://www.hotwire.com/

http://www.priceline.com/

http://www.cheaptickets.com/

http://www.cheapflights.com/

http://www.faremax.com/

http://www.traveldiscounters.com/

http://www.lowestfare.com/

http://www.skyauction.com/

http://www.onetravel.com/

http://www.flights.com/

http://www.airlineticketsdirect.com/

http://www.cheapoair.com/

http://www.bookingbuddy.com/

http://www.travelzoo.com/

http://www.kayak.com/

http://www.travelation.com/

http://www.airfare.com/

http://www.airgorilla.com/

http://www.lastminutetravel.com/

http://www.ticketspinner.com/

http://www.lowfares.com/

http://www.travelgrove.com/

http://www.farefox.com/

http://www.economytravel.com/

http://www.bargaintravel.com/

http://www.travelcuts.com/

For Students & Faculty:

http://www.statravel.com/

http://www.studentuniverse.com/

List of Airline Websites:

http://www.geocities.com/Thavery2000/

There are some geat sites where you can go and find the best prices, you could try the excellent airfarewatchdog, where they list all airlines, including Southwest and JetBlue.

This wesbite is very good for Europe, I don't know about USA but it's worth to give a try: http://www.routehunter.com/

Good Luck!

http://www.orbitz.com/

http://www.cheeptickets.com/

http://www.priceline.com/

try www.Kayak.com