I noticed that there is software (such as iExplorer) that allows you to access files on an iPhone-device from your Mac.
Now my question is: How can I access
Here is an old project to browse the iphone. You may be able to get some pointers from it on building an application to do the same with the latest info.
http://code.google.com/p/iphonelist/
Couple that with carbonic acid's post about the Mobile Device Framework and you should be able to do some good stuff.
if I find more unique info ill post it here.