I just bought a Ti-Nspire as well, you can unlock it and play GB games.
Excellent for Math class :3
The most advanced thing I ever touched... has to be this:

I had it since 2nd year of high school till first year of collage (that's like... for 7 years

), when I abandoned computer engineering and well, almost everything related to numbers. It was... a pretty good partner :3. Back in the day, it was the most "advanced" in the class. I remember using it to solve quadratic and other functions, converting and calculating with binary/hexadecimal/oct, statistics and other things in exams. As no other calculator there could solve those, the teachers never checked mine and I always used it. So it was kinda like... cheating xD (I still had to do the functions and other crap myself, since you had to write everything down, but the little machine helped me check the results). Later a friend of mine bought the fx570 (It was the same but without the solar panel). It was our little "secret" in assignments and exams

. Still, that was useful only for the first two years of high school. Then things got harder and the functions in the calc were not longer that "useful". Ahhh, high school... nice memories~ n.n
Now days, anything more advanced than this...

makes me dizzy xD
I better need a kanji calculator now... lol <.<