The iTunes App Store offers downloads of several apps for Apple iPhone, iPod touch, or iPad for free, as listed below. At up to $5 off, each is the best deal we've seen. The deals:

• Hairy Balls for iPhone, iPod touch, and iPad: Puzzle game
• Armorslays 2 for iPhone, iPod touch, and iPad: Action game
• ZOOKEEPER DX Touch Edition for iPhone, iPod touch, and iPad: Puzzle game
• IQ Mission for iPhone, iPod touch, and iPad: Brain-training tool
• Peterson Birds of North America for iPhone, iPod touch, and iPad: Birding tool
• Aerox for iPhone, iPod touch, and iPad: Accelerometer-based puzzle game
• Listo for iPhone, iPod touch, and iPad: List-making tool