Airgun Forums (a huge repository of useful information):    

• Airgun hunters forum
• American vintage airgun forum
• Chinese airgun forum
• Crosman airgun forum
• James Kitching Airgun Forum

• Chilean website for Spanish-speaking airgunners
• D&H Woodcrafters Wood stock blanks for QB78 and Crosman160
• Elliott on Airguns A book for airgunners and shooting enthusiasts
• General airgun information
• Gun information (including airguns)
• Hunting with airguns and other interesting topics
• JG Airguns A full service airgun parts and repair business
• Joe Matsusic's Original Silent Pellet Trap Page
• Kermit Airgun Club
• Vintage Crosman and Benjamin repairs

Firearms:

• ArmsVault The ultimate gateway to firearms related information
• Collecting and shooting military surplus rifles