The iTunes App Store offers downloads of several apps for Apple iPhone, iPod touch, or iPad for free, as listed below. At up to $3 off, each is the best deal we've seen. The deals:

• Build A Train for iPhone, iPod touch, and iPad: Virtual train set
• More ElectroTrains for iPhone, iPod touch, and iPad: Puzzle game
• Puzzle Retreat for iPhone, iPod touch, and iPad: Block-sliding puzzle game
• Simply North for iPhone, iPod touch, and iPad: Virtual-compass
• Dailybook (Journal/Diary) for iPhone, iPod touch, and iPad: Journaling tool
• Atlas by Collins for iPhone, iPod touch, and iPad: Map viewing tool
• Fireflies! for iPhone, iPod touch, and iPad: Color correction tool