Did you know that if you travel as a Student, you can save money? If you didn't, aren't you glad you came to our blog? Now here's the dirty little secret -- some of these organizations will let you book with them if you haven't cracked a textbook in decades.
Student discounts can be 10-25% below the market rate. You can even do better with group tours.
http://www.studentuniverse.com/ - will sell to Grad Students up 35.
http://www.statravel.com/ - is very liberal when it comes to your age.