You probably already follow TechCrunch but if you don't take a look at Flyspy, a very clever new idea for adding very useful information to booking flights online.
"The way it works is that I give it a departure city and a destination city and optionally a departure date and length of stay. The search result, which returns very quickly, will present me with a graph of flight prices over the next 30 days so that I can quickly look at which days are the cheapest to fly. To book a flight I just click on the point in the graph. Simple." (from "Flyspy Brings The New Web To Airline Ticketing")
Technorati Tags: onlinetravel