I started using Kayak.com when I was in college and looking for cheap flights home during holidays, and the site has only become more and more useful since then! Some of its best functionalities:
1) Easy-to-use filters: They have the "weekend only" option on the front page, but once you do your search, you can tailor the results down to what you really want: specific takeoff/landing times, no red-eye, certain airlines, no turboprops, layover times, etc. etc.
2) Email alerts: Since I fly frequently to certain airports, I set up alerts to tell me when prices drop below a certain price ceiling....
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“Love the AA batteries and IS technology”