ScriptPad is an electronic prescription pad for the iPad and iPhone. I assume you could use an iPod Touch with access to Wi-Fi, but the company website doesn’t say one way or the other.
My brother and I were talking about doing something like this on the iPhone a couple of years ago. An electronic prescription pad on the iPhone makes perfect sense as the iPhone is so prevalent among healthcare professionals. Even though ScriptPad is promoted for both the iPhone and iPad I’m convinced the iPhone is a better option. Most people carry their iPhones with them at all times. I don’t think you can say that about most iPad users.
SciptPad is looking for beta testers. Check the website for more information.