I recently found Airfare Watchdog, which has become my latest favorite thing in the world.
Thumbs Up Indeed
Basically, the Airfare Watchdog system publishes information on airfare which includes the coupon codes and deals that airlines offer to their customers. My first search on this site resulted in a fare of $113.58 to fly round-trip between San Diego and Vegas this week.
Up, up and away!
It would be smart to keep an eye on Airfare Watchdog in the future, especially when you have a flexible travel schedule.
Kayak.com is still my main go to site for quickly comparing airfares.
Orbitz.com is another good site to use when searching for flights.
Flying Out of this World
Starting this year, you can book a flight into space on Virgin Galactic. For $200,000 you can get yourself a seat on a ship that will travel all the way up to sub-orbital space, spend five minutes in zero gravity, snap a few pictures with the Earth in the background and return to terra firma. If you're one of the 475 people who have already placed a $20,000 deposit to later have the opportunity to blow an additional $180,000 on this experience with Virgin Galactic, I have a suggestion for you. Find a homeless person and tell them to watch as you set fire to a $100 bill.* You'll feel better about yourself when you wake up the next day with your $199,900 still in the bank and you'll basically get the same experience of showing the poor just what income inequality really means.
Laughing is optional
Here is the article from which I found the facts and figures related to space flight.
TL;DR: Airfare Watchdog is a really good resource when searching for cheap airfare.
*Don't actually do this because I'm fairly certain that willfully destroying U.S. currency is a crime.
Update: If you tell people you know in your personal life that you have just found a great new airfare website, they may ask you to look up fares for them rather than exploring the site themselves.