Use Kennens skills to farm in mid.

Kennen is a nice Champion with big damageoutput.
Eight always to use his passive to stun and kill the enemies....
Try to play him at mid because mid is the best places for is damage, he has no mana so you can perform magic so often you want.. :)

At start play always deffensivly and if you have your ult try to gank or try to kill your enemy on mid.

PROS:
Very Good Harasser
Very good at in and out damage
Carry (even though Riot doesn't mention it)
AoE Stuns

CONS:
Squishy and can be killed easily
Can be CC'd easily
They will start focusing you after they see the damage you do.

http://www.youtube.com/watch?v=pfUqP3drzNc ( little guide )

http://www.youtube.com/watch?v=sJGUIhBaxBc ( another guide )

http://www.youtube.com/watch?v=XC81iiMmlmA&feature=related ( and epic moments )

hope you enjoed it! :)

Final Words:
Kennen can be VERY nasty if played correctly, give it time, you wont go 22-0 your first game, Learn his abilities, remember to harass , and make them suffer for over-extending, and you will be making the team rage like never before!

If you have any questions or concerns, please post them here, and leave any tips you got for me.

Thanks for reading!

Kennen Video http://www.youtube.com/watch?v=Rx2UJa93XKU