Yes, especially HCHII's and new Prius models. I think well maintained HCHII's under 30,000m w/ HOV decals will retain 85-90% original value - assuming the end of decal line is indeed upon us.

Before the extension a new Prius w/ 22k on the odo went for MSRP at a local dealer in SoCal because it had the decals and everyone thought that was the last of them.

I will add the value will diminish the closer we get to 2011.