As I mentioned earlier, we’ve noticed that a big constituency of our Twitter/Flickr game Name That Zoom players are folks goofing off at work.  

We’re just now experimenting with giving prizes to winners (so far the only prize was a congratulatory tweet) and so we bought rearview mirrors that sit on your desk and alert you when someone is approaching.

I also included a free pass for four and a handwritten thank you/congrats note.