This is a simple Wordpress plugin that you can modify to fit your own needs. Use your iOS's application id and it will spit out some basic HTML that you can then apply your own styling to.
Why?
I wanted to make sure that I had accurate descriptions and current pricing information for all my apps wherever I display this data on my personal websites. This was the natural thing to do.
Check out the example of what it produces here:
http://www.mohawkapps.com/checkout-helper/