I’m trying to add documentation to my app to do so, I took a bunch of screenshots and added labels and arrows to them. Now I have a bunch of full screen 320×480 PNG files that I need to present to the user.
I really like the carousel example as outlined here, but it does not seem to work with the full screen images right out of the box:
iPhone carousel controller
What else can I use that I can just plug into my project to allow the user to move through multiple images back and forth with the side swiping gestures?
You want to do a UIScrollView that does paging, with each page probably being a UIImageView that contains your PNG.
You can take a look at a solution that is kind of like how Mobile Safari allows you to switch through tabs: UIScrollView horizontal paging like Mobile Safari tabs
If you want to do full-screen images, you can also look at the PhotoScroller example from Apple at http://developer.apple.com/library/ios/#samplecode/PhotoScroller/Introduction/Intro.html There was a great WWDC 2010 video that goes along with this that you should watch as well.
Finally, you should consider creating 640×960 PNG files as well, since that would look best on Retina screens.