My iPhone is one of the best purchases I made for my job. Seriously, every itinerant should have one these! Before my iPhone days, I used to carry around a digital recorder, a camera, an electronic dictionary, and a phone in my bag. Ugh - all of that extra weight! Now I have only one simple device I have to worry about! Not only is it nice to be able to send off a quick E-Mail between students, the apps are great for auditory training, vocabulary development, and reading development.
Some of my favorite applications: