Just a quick note, hopefully someone will find this useful as it took me forever to dig up, test, and confirm: if you are building an application that will run on a widescreen computer feeding to a 720p LCD, the resolution you want to target for the widescreen LCD is usually not the same ratio as the computer’s video output.
In my case, I was running a 1400×900 MacBook Pro with a 720p Samsung LCD. The Samsung’s resolution is 1366×768 (which is standard 16:9 widescreen). On the Mac, this 16:9 ratio converts to around 1400×787 — which means that we had to lop off the bottom 113px of the presentation.
If anyone has additional info to add, please pass it along.
