I really like the way the Pixelmator team just doesn't stop. Late last week they released version 3.1 Marble. The new version deliverers 16-bit per channel images on the new Mac Pro. I bet it screams. Both graphics cards work simultaneously to accelerate composition rendering and compute demanding tasks.
This new version also partners Pixelmator with MILK Print on Demand to offer a new Order Prints feature. You can now order prints right out of Pixelmator. You can get Pixelmator from the Mac App Store and learn more at the Pixelmator web site.