LVR's Digital Acquisition Resource Guide for iPhone/iPad
I just put this free app developed by NYC rental house, Liman Video Rental, on my phone and I'm loving it. As it's mostly a collection of camera manuals in tiny print, it's definitely best suited for the iPad but it gets the job done on the small screen as well. Now I can read the Phantom and Sony F35 manuals while on the subway. Nerd!
Also included - media record times, battery run times, lens charts and comparisons, and plenty of other handy info. An incredible resource for the professional camera person.