I want to go to Europe, someone I met up here suggested contiki.com. She said it was amazing, and I can't cant find a bad thing about it online. The trips range in time from 3 to 48(!) days long! Because I get three weeks off, I would probably take something in the 20 day range, and hopefully tag it onto a long weekend or something so that I can fit it in. The prices range between $300 to $4000 but you have to provide airfaire to London. From there its a whirlwind tour across the continent. It sounds pretty exciting.