i-to-i Volunteer and Adventure Travel

This seems to be more of those organizations that "work hard, play hard" - combining some volunteer serving with tourist activities.

They specialize in offering TEFL (Teaching English as a Foreign Language)

They offer programs by the week up to 12 weeks, but they also have some special internships every year for 2011 it's for China and Thailand.

http://www.i-to-i.com/