The Reflection app has been available for the Mac for a while and is now also available on Windows. The app allows you to display the screen of your IOS device (iPad, iPod or iPhone) on your computer, meaning you can easily switch to your device during presentations or record screencasts.
To establish a connection and share your screen your computer must be on the same network as your IOS device, but our initial impressions are that it is reasonably easy to establish a good connection. We had a play with the trial version of the app, which is fully functional but limited to 10 minute sessions. Have a look at our first impressions and quick guide to getting started below (2.26).