Ken Tidwell develops apps for the iOS operating system (iPhone, iPad, etc.). He has just released a new app which is a user’s guide to the Nikon D3100. This app is meant to be an alternative to carrying around the bulky Owners Manual and includes several other topics not covered in the manual. If you Shoot a D3100 you may want ot check this out. More info and a download link after the break.
For more info you can click this link to the original article posted at prMac. The article gives an in depth listing of the app and a download link. Good luck and have fun!