My favorite robot would have to go all the way back to Wildstang '00:
http://firstrobotics.net/00gallery/pages/111-1_jpg.htm
However there are a few other good ones, such as:
Think Pink '00:
http://firstrobotics.net/00gallery/pages/233-1_jpg.htm
Rage '00:
http://firstrobotics.net/00gallery/pages/173-2_jpg.htm
Wildstang '02:
http://www.wildstang.org/2002/invent...ent2.asp.html#
Division By Zero '05:
http://www.team229.org/robot/
Baxtor '00:
http://www.firstrobotics.net/00galle.../016-2_jpg.htm
there are a few of my favorites.
Some other ones that i couldn't find pics. of are
Beatty '01
Techno Ticks '03
Truck Town '02
Beatty '02