The Own Voice app has the potential to be the greatest (or most annoying) app ever created. The Own Voice app lets you personalize turn-by-turn directions by recording them yourself. This could be destructive if it got into the wrong hands.
Imagine if Fran Drescher gave you directions to the movie theater. There is also an awesome side to this, as you could record directions in any hilarious accent or voice that you can dream up. The Own Voice app has limited availability, seeing as how it's only for Nokia phones running Ovi Maps. I’m keeping my fingers crossed for mass availability soon.