If you happen to have an existing iPhone app in the AppStore, and wish to develop an iPad version of it, what route would you go? Universal or HD? An Universal app would combine both iPhone/iPad versions, while the HD app would support the iPad version only. I was thinking maybe the HD version might be better for sales, since it splits the app into two separate products. More apps to sell. And splitting the app up into two products would mean a smaller file size for each one.