Hot or Not Polls for exterior styling (and thread bump):
2007 Kappa-Based Saturn Sky
Saturn Curve
2006 Pontiac Solstice
Buick Bengal
Chevy Nomad
Vauxall VX Lightning
OLD Saturn Sky from 2002 Auto Show Circuit
with a few words and tidbits I've picked up:
Legend has it the newest addition, the 07 Sky is supposed to pick up a lot of the styling cues from the VX Lightning. I can see it, myself, in certain areas (outer front edges, a certain curve in the headlamps, the sharper rear decklid "humps", and the hood vents and side scoops are some common themes I noticed).
It's unfortunate, but Saturn's unoriginal marketing folks seemed to be stuck on the name "Sky" and so we have two very different vehicles with the same name - luckily, they seem to have had no influence on the design...

Thank goodness for small miracles.
The Curve and Nomad were from last year's show circuit - 12" extended wheelbase versions of the Kappa Architecture.
At one time, I... unhhh... I mean Bob Lutz had a vision of producing the "Topless Triplets" on the same platform - at the time it included my... unnhhhh... his baby, the Solstice, and relied on the Buick Bengal and OLD Saturn Sky to increase the platform volume.
Hope that helps, new folks arriving:
Welcome! Add your $0.02 and give exterior styling a grade!!