Enter your parameters and then hit about a dozen different travel search engines. Each opens in a fresh window so you can then toggle back and forth to compare without having to write a lot of stuff down.
I booked through Continental Airlines website last week to book my flight to Vegas for this years Bash and last week when I booked it i got it for $288 and heard on the news that they raised their rates and sure enough typed in the same flight and it went up $50 because of the high fuel prices.