Too many times. I used to keep a case on it, but it would fill up with sanding/saw dust on the regular, and annoyed the crap out of me. Not to mention I didn't like the size of it with the case.
So I took it off and it stayed off. However it's hit the floor several times since then. HARD. Ceramic 12x12" tile, hardwood, and I'd like to say terrazo, terraza.. whatever that crap is they usually use at malls. Concrete too.
Screen hasn't broken, but the body of the phone is showing battle scars. The area surrounding the SIM try has cracked at opposing corners, and the rim of the body surrounding the screen is dented and left a couple weird flat spots protruding beyond the screen (so it's no longer flush with the screen).
The screen doesn't have a scratch on it, though.