The web-based creative apps at Aviary are out of private beta!
Go check ’em out — it’s Adobe Creative Suite in the cloud.
My favorite of them is actually the simplest: Toucan, which helps you make color swatches. More and more I realize the key to great images is color — awareness of it, attention to it. Usually I just jack a palette from Kuler but this app makes it easy to build one from scratch.