BiblicalTraining.org is one of the best online resources for great lecture series on theology, apologetics, and other discipleship resources. Now their app is available on the iTunes app store for iPhone/iPad. You can now access and listen to all the BiblicalTraining lectures on your mobile device. (If you don't have an Apple device, you can also use their mobile site.) For more about the app, go here.
Download the BiblicalTraining App here.