Out having a ride during lunch yesterday, I was almost back to the office when *crack* my seat post broke!
The platform where the bolt goes through broke right in half. Luckily I stayed in the pedals and didn't crash, but my lower back is really sore today. I still commuted home, my wife dropped me and a new seat post off this morning.
Apparently, I'd let the seat work its way to the front of the 'bars', and all my weight was kind of hanging out behind the platform of the post. I'll keep a closer eye on this new one, to be sure.