I went to National MathCounts 2001 and 2002. They gave us TI-89s in 2001, but then they got cheap. *pout*
Anyways, I do AMC's/AIMEs, ARML, Mandelbrot, Rose-Hulman (local competition), and I hope to make it at least to USAMO this year.
I still have my 2001 hat, with all the pins on it. It's good for whacking people.