ITA Software’s site is good for finding a good airfare, what about hotels and rental cars? Which site has the best “deals”?
Another option is Kayak (http://www.kayak.com). It is a meta-search engine, which means it searches other sites and presents all the results in one place. When you click on the deal you like you are taken to the best site to book it.
Travel is expensive; saving money on it goes to your bottom line (or stays in your pocket).