Hi Shannon,
There are dozens of Disney parks related apps out there. I have fifteen on my iPhone right now.
The official Disney app is called
Mobile Magic. It includes maps and lots of park information.
One of my favorite unofficial apps is called Lines. It's put out by the folks that write the Unofficial Guide to Walt Disney World and touringplans.com. With Lines (WDW Lines), you can input your desired attractions and it will tell you the most time adventageous order in which to do them. It can be a HUGE time saver.
I also like an app called TWiz, which is gives transportation suggestions from one point to another within Walt Disney World.
If you go onto the app store on iTunes, you'll find many more - everything from restaurant menus to Vinylmation purchasing checklists. That's a great place to start.
Happy planning.