[AhXian]

few fun things i found, might have minor spoilers:

Spoiler!

-first time u meet naomi theres a hidden L1 scene allowing u to look up her skirt
-During a cutscence, you can shake your controller to return snake to his regular camo
-in the Shadow Moses when at Otacon's office... he asks you for the code... input 14893 (deren's freq) that will give you 100,000 DP points!
-in the vista mansion there's two posters of akina minami, when snake views these in first person he will call out the models name and his psyche guage will go up
-if you call rose on the codec and shake your sixaxis, her boobs will jiggle.
-the game Sunny is playing on the p2p (in the briefing for Act 2) is Penguin Adventure, the first game designed by Hideo Kojima, for the MSX in 1986.