I've changed quite a bit since I was a wee little baby.
Most noticable is probably that I went from very religious to atheist in a very short time, and the personality change that came with that. The personality change wasn't intentional really, but people have been telling me that I've been acting way nicer to my friends while being more open about my dislike for others. I've become quite eloquent since then, which has brought me quite a bit of respect from my fellow peers.
I started to put my own desires in front of what others expected of me after my "change", too. I dyed my hair black despite protests from my family and certain friends. My mind is way more open to new and interesting things.
Myself, I couldn't be happier at who am I right now. I feel like for once I can be myself. This has lead to quite a few things, like my ocassional moments of utter silliness, like going dressed as Santa to my high school final exams, which were during summertime.
And to think all this was caused by one single person at my confirmation. I should send her a thank you-card really.
As for smaller things, my musical taste has changed quite a lot over the years, going from pop to rap to metal to orchestral. Now I listen to everything that I find is good music, whatever that might be. I recently discovered, thanks to the Mass Effect 2 launch trailer, a symphonic orchestra called Two Steps From Hell that make absolutley stunning music.