Hi H.,
my daughter, age 8, and son, age 6, have been going to KS WTMA Tae Kwon Do for 18 months and they love it. Their instructor, Master Ma, is incredible with the kids.
They are located at the corner of Rt 108 and 216 in Clarksville. I looked into 3 other studios before going with this one because they have smaller classes, more individualized attention, and a flexible schedule. They were ranked as one of the top 2 martial arts programs in howard county (best of howard county, dec 2009). Following is their website:
http://www.kswhitetigermartialarts.com/index.htm
If you do go, please let Master Ma know that Erica and Adam's mom referred you and he will give you a free lesson. Good luck.
-S.