Syphon Filter 2 - Sony's official site. Mission, agents, environments and weapons. - http://www.us.playstation.com/PSone/Games/Syphon_Filter_2/OGS/
Neoseeker - Offers cheats, several FAQs and walkthroughs, reviews, screen shots, and a discussion board. - http://www.neoseeker.com/Games/Products/PSX/syphon2/syphon2_cheats.html