I LOVE this. Only my 2nd commute, and I am thoroughly addicted. I must be particularly endorphin-susceptible or something, because when I got to school today my friends thought I was high. I had just ridden 15 miles to get there, so I guess I was a little bit. Biking just makes me HAPPY. It was 90 degrees when I rode home, and I have some killer hills in the mix, and I was still singing all the way. Especially when I passed a guy (in a red convertible) who had earlier cut me off - he was stuck in traffic as I cruised by. Oh, so lovely.