Figuring out what the Third Culture Kid experience is can be a daunting task. Thankfully many have gone before us. Here are some resources we think you might find helpful. Please recommend more to us as they come across your desk:

Links:
Mu Kappa - a fraternal association of MKs in college. Provides many good links as well as sponsoring many re-entry programs for TCKs.
Barnabas Re-Entry Retreats - These weeks are designed to help MKs transitioning back to North America with the process. We highly recommend them.
The Carry On Journal - a journal of stories from the TCK lifestyle.
Lost In Transit - Group blog of expatriates living around the world (though mostly in a Western context)
International Children's Education - Publications on transitioning into the US school system from overseas both college and high school.
Interact International - An organization dedicated to the Third Culture Kid experience.
SHARE Education Services - Dedicated to helping your child find the best education route.

Articles:
Rooted To Nowhere by Hanna Kite
When No Place Feels Like Home by Corinna Schuler
Often more accomplished, but sometimes more troubled by Gretchen Lang
Nowhere to Call Home But I Like Being a Global Nomad by Anne-Sophie Bolon
For Teens, It’s a Tough Transition by Nora FitzGerald

Books:
Third Culture Kids: The Experience of Growing Up Among Worlds by David C. Pollok & Ruth Van Reken