FormEntry Touch, a recent release from WidgetPress (makers of ModelBaker), makes setting up form-based systems on iPads and iPhones easier than ever. The universal app is static, in that it requires no coding; it reads forms from the application you build with FormEntry for Mac and run on the FormEntry Server. Put it all together, and it looks like a pretty great setup for rapidly creating form-based applications which interact with a central database.
There are a lot of possibilities for something like this, across a variety of applications. You could build a