I've been beta testing this since they started publicly testing it and I love the user interface and how easy it is to use to build simple gradients. It's now available in the Mac App Store for $4.99 which is a bit more than a casual user would spend but is a time saver for any web design/developer that's well worth it.

They also include a nifty tutorial on-screen the first time you launch the app:

Pick it up if, like me, you were disappointed in how Apple changed the DigitalColor.app.