how about a Serotta road bike with a rear suspension designed by Dave Kirk?
The seat stays are curved, not unlike a Hetchins Vibrant, but has a pivot at the point where it joins the dropouts. This allows the the stay to flex and rotate at the dropout.
It even includes some elastomer attached to the stays, to damp the motion. Pretty novel, and much more functional than the Hetchins curved stays (but not as good looking.
)
Steve in Peoria