Many people are using web apps for that purpose. You can publish a web-app with your own server instead of appStore and use it with iPad´s Safari web-browser where you can "install" it to you iPad´s desktop when it looks and feels like real native iOS app. Computer users will usually be able to read it too.
Check for instance:
It´s a landscape version so if you use iPad, rotate it to landscape as well.
If you want to get best appereance, tap arrow button on the left side of your Safari´s address bar and choose Add Home Screen.
That sample has been made from InDesign by using a product called eDocker Tablet Publisher, you will find more info about it, free trial, etc. at http://www.edocker.com
Thanks for the info. I was hoping I didn't have to purchase something else.
Is there a way from InDesign CS6 to create files that will show well on the iPad without Digital Publishing Suite. That is my main question. I'd rather just upgrade my InDesign than buy additional software.
E-pub is one, PDF is another solution "out of the box". InDesign is certainly not advertised as "now it makes your Apps for you as well!".