I found this website the other day. It comes in handy when you want to search multiple websites for a flight or hotel or even vacation package!  I would definately recommend this site.  Saved much time in switching and remembering different airline searching engines.  Check it out: http://www.bookingbuddy.com/

If you are a student, then I would also use this website: http://www.statravel.com/.  This website has great deals for people under 26.  Student packages, around the world tickets, etc.