The quantity of options in a simple app like this are surprising. Choose from six different kinds of backgrounds, including photos shot with the phone's camera, existing album photos, a solid color, a webpage pulled from an in-app browser, a map of your location or a library of six included backgrounds.
Next, select from a bevy of colors and line thickness for drawing or the provided clip art. Finally, save the sketch in the app, export it out to your photo album or send it to Twitter. And even as you use the app, more fun appears -- there's a cool Etch-a-Sketch-like shake feature to erase what you've drawn, and the zoom button can move you in close for even more detail.
Text input is missing (and reportedly will be included in a later version), but as a quick sketch creator (you won't be designing the Mona Lisa with this, more like circling something on a map or pic before a quick upload to Twitter), Sketches is a really fun, very professional app. LateNiteSoft has it up to 1.2 so far, and even though I had no intention of buying it when I pressed the "Buy App" button without thinking (weren't we all a little feverish when the App Store first dropped?), I don't regret my purchase one bit.