I was fortunately enough to direct and storyboard on the second season of Xiaolin Showdown.
Below are some of my episodes.
Xiaolin Showdown: Sizing Up Omi
Xiaolin Showdown: Hear Some Evil, See Some Evil
Xiaolin Showdown: The Evil Within
Xiaolin Showdown: The Black Vipers 
Xiaolin Showdown: The Last Temptation of Raimundo
Xiaolin Showdown: The New Order
Xiaolin Showdown: Dangerous Minds

Additionally you can see some of the storyboards I drew for the show here.