From The Washington Post:

A comic quiz:
Who was the first host ever of "Saturday Night Live"?
Who appeared with Doris Day in "With Six You Get Eggroll"?
And who has appeared on "The Tonight Show" more than 130 times?
If you answered George Carlin, you perhaps have spent too much time listening to his 22 albums or watching his 14 specials on HBO, or are a true, true fan.
In the comic spotlight for more than 50 years, Carlin was tapped yesterday by the Kennedy Center to receive this year's Mark Twain Prize, a lifetime achievement award presented to an outstanding comedian.
Carlin, 71, reinvented social commentary, discussing everything from religion and politics to airport security. He excelled at stand-up, whether at the Roostertail in Detroit, the old Cellar Door in Washington or Carnegie Hall. His three books have been bestsellers. He has won four Grammy Awards, spanning 1973 to 2002. His TV shows have been nominated for five Emmys.
The rest of the article is here.