Just a warning, I've heard of people using it with iPhone and the farther you go, the farther off it can get with distance. A friend and I were training for a half marathon, and I was wearing a Garmin and her the iPhone with MapMyRun, and over like 13 miles, the MMR got off progressively more as we went. It was off by about 0.1 in the first mile or two, and that error compounded. I'm not sure how far off it was in the end. If you're just doing shorter distances, it probably doesn't matter much.
Re: MapMyRun for Blackberry?
Baby Girl #2 is on her way!