This totally made my day! John does the voice of one of the squirrels in a season two episode of 'American Dad.' He does some other voices in the episode, but I can't find it online anywhere. It's called 'Irregarding Steve.'
Gallery Form - Best For Finding A Particular Scene
The following is a list of websites where you can find The Office screencaps.
For those unfamiliar with the terms found below: "Gallery Form" means the site has posted their screencaps in a form where you can view all of the caps without downloading (see image on right), but if you want to save an image, you must do so one por one. "Zip File Form" means the site has saved all the screencaps in one file and you can download them all to your computer. The Gallery Form works best if you are just looking for one specific scene. The screencaps listed as "HDTV" were capped in high definition and are...