I second the sunroof.

Adjustable interval wipers. I had these on my last car, a Celica. It's the only feature I really miss from that car.

More colors! Priuses seems to have gotten that this year. I love the forest green Pruises came with in '01 or '02.

Heads-up display of current mpg.

Hybrid pickups for rent. If they can make V6 hybrids, why not?

Turn signals on the mirrors for Insights. I think some of the SUVs are just too tall to see my taillights when behind me at a traffic light.

Heated beverage holder--for coffee drinks.

iPod mount port next to the power port on the dash. Just for iPods.

Insights: polished nude all-aluminum body option, like Deloreans.

SUV hybrid: built-in Saeco semiautomatic espresso maker for those car camping trips.