Well, some of the ones that come right to my mind would be the following -
Team 88 - Thunderdrums and thundersticks (alas the sticks are no more), and you can't forget the Moe socks....
Team 105 - yeah, you know them from this year as the cowbell people

And the launching of the stuffed animals at BattleCry was just too funny. This is what happens when you give the techie kids too much free time
Team 190 - Ok, there was no way I could ignore the hampster power cheer....just waaaay too strange

especially at River Rage
Team 168 - A little Miami, FL team that looked like hippies, and no matter the odds cheered like crazy waving their tie dyed flags. You could even see their spirit on the pit tent celing as they shone a light right to the top projecting their logo.
Team 237 - these guys are plain nuts, and armed with their digeridoos, they are both seen and heard
Team 419 - come on, the guys from BC High have made quite a showing for themselves in the past 2 years. One of the most memorable was in 2000 as they painted their ally's name on their chests and then ran around Richmond screaming....still one of the funnier bits of tape I think in my collection
~ lora