Low vision iPad - tips and resources to share?

I'm configuring an iPad for my low vision[1], wheelchair bound, 80yo mother (family Birthday present). We tested one out at an app store and she did pretty well with the book reader alternating between 3 finger tap to magnify and VoiceOver on demand (3 click the home button).

One curiosity -- in some ways she is better off with iPhone apps than with native iPad apps. The simpler UI, doubled to fill the larger screen, is just about right. I hope we'll be able to continue to use iPhone apps on the iPad, and that developers who bundle both in one package provide a configuration option to run in iPhone mode on the iPad (Apple could add that option to the system level).

I'll be posting on this on my personal hobby (no ads) tech blog. I'll add links to future posts to this initial post: http://tech.kateva.org/2010/06/ipad-for-low-vision-elderly.html

Does anyone have any experiences or tips to share? Any good resources to visit?

[1] Macular degeneration. Different causes of low vision need somewhat different UI approaches and configuration. If she lives long enough she'll probably be entirely blind, but it's possible that, if she becomes familiar with VoiceOver now, that she'll be able to transition to full VO UI.