Affiliated Sites:

Zone of the Enders: The Unofficial Site
Kojima Productions Network

Official Sites:

Metal Gear Solid: Peace Walker Official Site
Metal Gear Solid: Rising Official Site
Metal Gear Online Official Site
Kojima Productions Blogcast
Hideo Kojima's Twitter
English Translation of Hideo Kojima's Twitter

Collection Sites:

Metal Gear Collection (Arsenal Gear) Die Snake.com - The Metal Gear Collector Forum

Shopping Sites:

Play-Asia.com - Buy Video Games for Consoles and PC - from Japan, Korea and other regions!
Amazon.co.uk - Low Prices on Electronics, Books, Sports Equipment and More!

Link to Metal Gear Collection.com:

Metal Gear Collection.com