For those of you out there with low back pain that gets worse with jarring or compression type stresses (disc buldges, spondylolithesis for eg) there's a new seat post out there that could help.

The Cirrus Cycles Body Float.

I had some exposure to this seat post at a Physical Therapy specific Bike fitting/injury class this last weekend. It's pretty slick. It's also pretty spendy. Right now they are only making them as they are ordered as one-offs. I don't know what the wait is on one of these.