I've been using my computer or laptop to aid my RPG efforts for many years now. In the last two years, I've ditched the DM screen for a laptop. (I love my MacBook Pro.) But I've recently replaced my old Motorola RAZR with the iPhone 3GS, and I love it. So I've been looking for ways to use it at the table as an aid.

I've found that computers and apps are not necessarily time savers at the table. For example, using initiative cards is at least as fast and convenient as iNit for tracking initiative, but I use iNit anyways. For one, there's less clutter on the table and less for me to clean up at the end of the night. 

I've found a handful of apps, written for the iPhone, that are a great start: