The utmost respect for the legendary...

• Iditarod

You gotta give credit to those who came before...

• A huge thanks to our NYC Idiotarod friends, mushing since 2003.
• The San Francisco Urban Iditarod, established in 1994(!).
• The Vancouver Shopping Kart Race, raising hell since 1997.
• The Ann Arbor Shopping Cart Race, tearing it up since 1997.
• The Portland Urban Iditarod, running since 2002.

And those who have come after...

• The Washington, D.C. Urban Idiotarod, racing since 2006.
• The Seattle Iditarod, cavorting since 2007.
• The Los Angeles Urban Iditarod, romping since 2007.
• The Phoenix Idiotarod, carousing since 2007.
• The Cinciditarod, beginning in 2008.
• The Iowa City Iditarod, also starting in 2008.
• The Denver Iditarod, following suit in 2008.
• The Toronto Idiotarod, founded in 2008.

Of course, dear ol' Wikipedia has an article on the phenomenon that is urban shopping cart racing.

L-->R: Vancouver cart engulfed in flames (not recommended); D.C. 2007 winners