I was looking at Kennen, and I saw two things that made me think he'd do okay as an AD champ:
Every 5th autoattack Ken does adds a Mark of the storm and deals 40% – 80% (based on rank) of his attack damage as magic damage.
His auto attack range is 575, making him very dangerous.
His AP side is very powerful already, so I wonder if AD kennen be looked upon for competitive play.
Best Answer
It has been done. Genja from M5 used AD Kennen effectively.
Here's a video, not sure if there are any guides, but I believe people rush Phantom Dancer's.
http://www.own3d.tv/video/418594/M5_-_AD_Kennen