dxTop is a very beautiful theme for your Samsung Captivate. It completely takes out the effect and look of Android from your phone. The wallpaper that you get with the theme is also pretty good. And you get a 5 icon dock at the bottom of your screen. You have shortcuts for 5 different items over there, like SMS, contacts and others. Quiet useful. But to install this theme you will need either aHome or Open Home on your phone. Download the theme from here.