Berkeley Breathed tried something but 25 newspapers have refused to publish it, including WaPo
http://www.berkeleybreathed.com/pages/index.asp
Note to Opus readers: The Opus strips for August 26 and September 2 have been withheld from publication by a large number of client newspapers across the country, including Opus' host paper The Washington Post. The strips may be viewed in a large format on their respective dates at Salon.com.