American Film Institute's Top 100 Movies Lists
ESPN's Top 100 Athletes of the Twentieth Century
Lyrics! (look it up, get it right, quote liberally)
Food Network.com (spice up your mother's tongue)
National Weather Service (tons of data if you can figure out how to get to it)
US Census Bureau (everything you ever wanted to know - and you paid for it)
Interesting Lists
100 Worst Ideas of the 20th Century
2nd Millennium - Events and People
Life Magazine Top 100 Events of the 2nd Millennium