Dear ... 
Thank you for the pleasurable interview today.  Your creative approach to management has definitely confirmed my desire to work with you. 
As I mentioned during our interview, I am confident that given the chance, I could contribute a great deal to your company’s objectives and goals.  One of my greatest strengths is the ability to motivate a team to strive for excellence, while working together in harmony to achieve our common goals.  That combined with my thorough knowledge of __(your area of expertise)__ would enable me to make a significant contribution to the efforts of your team. 
Thank you again, for your time and consideration.  The interview strengthened my interest and enthusiasm for this position and I look forward to the opportunity to speak with you again.   
Sincerely,