I got hit one time. The car was pulling out of a parking lot and apparently didn't see me. Luckily, it was a fairly low speed collision. I bounced across the hood of the car but was uninjured. My bike got off with just a new front wheel.

Another time, I was right-hooked by a car, but managed to stop before making contact. I did, however, flip over the handlebars and badly sprained both elbows. I rode home, but by that night I couldn't bend my arm enough to get food to my mouth. I wasn't able to ride again for over a month.

Both of these incidents came in my first year of commuting.