Hi !
There is an iAmiga project for non-jailbroken iOS devices here:
http://www.lesbird.com/iAmiga/default.html
It seems to be a fork of the original project from Manomio.
You need to download the sources and build it with XCode 4.5 note: I haven't tried it yet.
So, you need a Mac with Xcode and a developer licence.
Note: if you don't have a developer licence, you should only be able to see iAmiga in the emulator on your macosx.
If you want to install it on your (jailbroken?) ipad anyway, check this link :
http://jailcoder.com/
Note2: if you don't have a Mac, they are also ways to install it on a PC (I've made it on dual boot with windows7 on a Dell XPS m1530 laptop)... For an howto, search the web...
Note3: I also have a Google Nexus7 tablet with Android and there is a free Amiga emulator (UAE4Droid) that can be installed without all that bothering.
The cool thing would be an ipa that could be installed on a jailbroken device.
Remember : Amiga will never die !