I'm a geekette who enjoys playing with new technology for software developers. I work as a Developer Evangelist for Microsoft. My current focus is on Windows Store development for Windows 8.
Are you familiar with WPF? If so, you’re most of the way there with Surface development! Many of the Surface controls derive from and have similar functionality to corresponding WPF controls, but provide extra enhancements for the Surface. For example, the Surface’s SurfaceWindow has very close functionality to the WPF Window, except the SurfaceWindow runs full screen on the Surface (because all Surface apps run maximized on the Surface space) and automatically orients the display toward the user (since the Surface is a 360-degree environment). The table below illustrates some examples of WPF controls, the equivalent Surface controls, and the extra functionality that the Surface control gives to support the Surface multi-touch experience.
Of course, this is not a comprehensive list of controls. There are many more Surface controls than just these. For example, in addition to the SurfaceButton, there is a SurfaceRadioButton, SurfaceCheckBox, and SurfaceToggleButton, and they share the extra functionality of only clicking when all contacts are removed from the control. So if two users touch a SurfaceButton or one of these other controls, and then one user lifts his finger, the "Click" event will not fire until the second user lifts her finger too.
However, this table does demonstrate the broad categories of controls available, and gives you a flavor for the extra functionality that you get with the Surface version - support for multi-touch, the 360-degree environment, and the other unique attributes of Surface.
Finally, the Surface SDK (where these controls live) is not available to the public at this point. The Surface team has given away access at major conferences such as PDC if you attended the Surface sessions or tried the Surface hands-on labs. You also get access to the Surface SDK when you purchase a Surface developer unit. If you have a serious interest in Surface development, let me know.