Reason Morning LInks: Enemy Militants Join Hands To Fight U.S., Housing Prices Down, Earmarking Meets "Lettermarking"

• U.S. presence is uniting rival militant groups on the Afghan-Pakistani border.
• Housing prices drop.
• Anti-earmarking congressmen get pork-barrel funding by other means.
• Textbooks used in Virginia schools filled with errors.
• Life in a Chinese leper colony.