ohoh Andy... you opened another door... You know I can't control myself!! 
Auction houses all over are racing to the internet to sell cars wholesale. The "trust worthy" condition report is the stumbling block. From my seat, the stick in the mud is the standards & training needed to produce a condition report. Much of it is judgmental and prone to human error.
IMO there is an opportunity for an independent 3rd party like KBB or HomeNet or DealerSpecialties or NADA or someone to create a condition reporting method AND a feedback/incentive system to make it self-policing.
Anyways... If they get a certified vehicle condition report in place, then it only makes sense for it to make it out onto the retail arena. IF that happens <gulp> it will TOTALLY change the used car world as we know it.
It's the last step needed to totally flatten the used car shopping experience.
Imagine the simplicity of a search for a [year] [make] [model] [trim] [pkg] with miles from__ to___ with a condition report grade no less than ___. Ouch! say good buy to margins. It'll open the doors to internet behemoths like PriceLine.com, kayak, pricegrabber and more.
Keep a weary eye on this, I see trouble ahead.