These articles offer some helpful tips:
http://usteacher.biz/2010/10/the-ten-commandments-of-parenting-teenagers/
http://www.huffingtonpost.com/melinda-hutchings/how-to-talk-to-your-teena_b_749863.html
http://familylaw.igetblog.net/family-law-outline/parents-of-teenagers-help-your-teen-set-boundaries/
http://teenbrain.drugfree.org/tools/underconstruction/communicating.html
http://www.danklavitter.com/732/
http://connectwithyourteens.blogspot.com/2010/11/myth-busting-for-parents-of-teenagers.html