Buying flights online
I've tried Orbitz and Expedia, but today I was reminded by Terri-without-a-blog about www.sidestep.com.
If you haven't tried it yet, they are very cool. It appears that they search everybody else's flight site (I bet they have to be quite sneaky to get away with that) and display the best results.
It worked for me; I needed a one-way flight to DFW on 3/10 and scored one for $104 non-stop. Orbitz was over $300!