One of the best reasons to come to a conference like GDC Online (which I'm at this week in Austin, Texas) is touching base with others in the iPhone and iPad community and sharing your favorite apps with each other. I've been hooking as many people as I can on Pocket Frogs (I just passed 50% of awards completed, and the app just added Game Center integration in a new update), and my colleague Jeff Scott of 148Apps recommended Blue Defense: Second Wave! to me. Blue Defense is a top-down shooter with an iPhone twist -- instead of moving your ship around as it shoots down enemy ships in 2D, you tilt your iPhone (or just touch the screen) to aim a planetary ca
