My brother, Chip, and I really love listening to Bob Vincent's bold, clear teaching. I encourage you to explore his other sermons. Right now, we're going through this series on The Fruit of the Spirit.
Introduction to Fruit of the Spirit
Love: It's not about me
Joy: It's series business
Peace: It's not just no war
Longsuffering: It's redemptive
Gentleness and Goodness: They're not just synonyms
Faith: It's about a trustworthy God
Meekness: It's not about being intimidated
Temperance: It's not about self-control
If you need something a bit more basic, consider listening to his two sermons titled, "Hold Fast to the Basics" (part one and two). I know I often need to go back to the basics of the gospel, and I encourage you to as well!
Hold Fast to the Basics, part 1
Hold Fast to the Basics, part 2
Sermon audio has an app for iPhones. I do not have an iPhone, but I often download sermons to my mobile (just click where it says MP3 on the page, I click the MP3 link that says "lower bitrate" by it). In fact, I'm listening to one now!