"Many of us at Mozilla and within the Mozilla community were excited when Stephen Colbert gave Firefox 3 his 'Colbert Bump' on the day of Firefox 3's launch (a big thanks to Jonathan Zittrain). You can watch the video here.
"Download Day was a wild success, and we were happy to share some thanks and credit with Stephen. However, a few questions naturally arose, e.g., what was the direct impact of the Colbert Bump? and could the effect be precisely measured...?"