Logo 1 (1999 - 2008):
Logo 1 - Alternate Version (2002-2004?, used for marketing):
Logo 2 (2005-2006, was used briefly for marketing):
Logo 3 (2008-Present):
Logo 4 [Original logo] (1999-Present, used in theme song):
My personal favorite is the alternate version of the first logo, I love how all of the main cast is included, (except for Gary) .