I wanted to give a quick plug to one of my favorite apps to use at the Park. It's called MouseWait and it's one of the most useful apps I've ever come across. Well, for me personally anyway.
I was searching the App Store one day trying to find one that would give me up to the minute attraction wait times at Disneyland. I found MouseWait and downloaded it to try (it's free!!), and I've been in love ever since! There are a ton of people who are in the Parks every day, updating the wait times as they walk around all day. I'd say it's probably the most accurate one you'll find. It comes in very handy for helping to plan while you're there.
There are several other features within the app, including the MouseWait Lounge - a whole forum of really awesome people who post lots of useful tips and information, and also post real-time photos from their adventures in the Parks.
If you download the app, also be sure to check out the "iResource" section...my favorite part is the iPhone Charging Station List (for anything you need to plug in, not just your iPhone). There's also a section for Passholders that shows blackout dates, discounts, etc.
I believe the app is also available for Android, but I'm not sure about any other phones.