Not just eye-candy, but useful too.
Saffron is an AIR-based UML app that looks phenomenal.
You’ll also find a good-looking showcase of Flex/AIR apps over at scalenine. I’m amazed at the creativity and concern for the user shown in Flex and AIR apps.
Design is important, just look at the iPod [i don't have an iPhone .. yet .. so ... :)]. AIR+Flex make it easy and enjoyable to tackle both design and functionality.