Bandana:  When you finish the game without submitting to the torture you will go off into the sunset with Meryl but just before she will find a bandana with the words limetless sewn on. If you wait out the creditts and save the game, the next time you play it you will restart the game with the bandana in your inventory. It will allow you infinate ammo.

Camera: You can get a digital camera with a security level 4 or up card, a little stealth and a block of C4 plastic explosive. At the end of the hall where you blow open a hole to go face Ocelot another wall can be blown open to reveal two doors one level 6 the other 4. The camera is in the level 4 door. You can take pictures and save them in an album on your memory card but it takes up 2 blocks.

I'm not sure exactly how this works but you can find phantom images of the game production team if you take pictures in the following places:

                1. Kojima: Otacon lab (the picture frame to the right)
                2. Matsuhana: Hallway of corpses (outside Otacons lab)
                3. Sato: Comm Tower A (roof destroyed by a Hind D missiles)
                4. Nakamura: In Meryl's blood pool (where she is sniped)
                5. Shinkawa: Deep in Sniper Wolf's hallway behind the second pillar
                6. Uehara: Edge of elevator (the one were the ravens are)
                7. Negishi: Sewage waterfall
                8. Mizutani: When fighting Metal Gear
                9. Korekado: Men's restroom
                10. Sasaki: Picture frames in the Commanders room
                11. Sonoyama: Torture machine
                12. Toyota: Container in the middle of Raven's warehouse
                13. Kozyou: Behind the watertank-like structure in the Canyon
                14. Shimizu: Wolf dog cave (first crawling point)
                15. Kaneda: The mirror located in the Women's restroom
                16. Fukushima: Heliport, looking out to sea from cliff
                17. Takade: Ninja room, glass edge
                18. Fujimura: Elevator, in the Comm Tower B complex
                19. Shikama: Electric floor
                20. Kimura: Metal Gear underground base, tip of of Metal Gear's railgun
                21. Kobayashi: Rock in canyon
                22. Okajima: Maggots of the real DARPA Chef in cell
                23. Nishimura: Next to Baker's corpse
                24. Mukaide: Reflection in wolfdog cave puddle
                25. Onoda: Where Baker is tied up
                26. Kitao: Decoy Octopus (fake DARPA chief) corpse
                27. Yoshimura: Dead end of air duct
                28. Hirano: Elevator (Comm Twr B) deep in the shaft of top level
                29. Muraoka: Water in cargo dock
                30. Ishiyama: Heliport top of building
                31. Ito: Inside elevator to tank hangar
                32. Jerem Blaustein: Sniper Wolfs corpse
                33. Yoshioka: Bridge on the third floor of the blast furnace
                34. Mori: Lowest point of elevator (Comm Twr B)
                35. Kinbara: Dark area of stairs
                36. Tougo: End of boiler room (in Blast Furnace where the stem is)
                37. Makimura: Hidden armory store room (behind the weakened wall)
                38. Kutome: Observation room
                39. Tanaka: Heliport, sleeping soilder
                40. Shigeno: Heliport, security camera by staircase
                41. Yamashita: Tip of nuke warhead in nuke storage room
                42. Kobayashi: Johnny Sasaki holding cell, near DARPA chief
                43. Scott Dolph: Way down in the dark from the walkway between Comm Tower A and B

(see the "Eye candy" section for samples)
 
 
 
Stealth Gear:   If you submit to the torture the game will end sadly but you will be greatly compensated with a stealth suite. You will be able to walk right in front of the soldiers and they won't fire on you. If you get C4 you can plant it on their backs and blow them to itty bitty scraps-o-soldier. The stealth suite won't work on bosses or on unavoidable soldiers like the ones who attack you in the cell or on the elevator.
 
 

Tuxedo:  When you finish the game twice on the same memory card block while getting different endings each time, the next time you play (while saving again) Snake willl play through the game in a tux starting from when he's on the first elevaor. It doesn't do any thing as far as I know but it's funny and the Bond similaruty is obvious.
 
 

Red Ninja:  If you can get the tuxedo you can have the ninja show up in a red exoskeleton by simply not using the bandana or the stealth gear until you see him. Again it doesn't do much but it's something to know.