This is the side Easter Egg when at the main menu for Black Ops.

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Breaking Free
On the Main Menu, alternately tap RIGHT and LEFT triggers (or hold the Space bar on a keyboard). After a bit, you'll stand up. Leave your seat and examine the back wall.

A small black and white computer terminal can be found here. Approach it and enter these codes using the on-screen keyboard in the "Central Intelligence Agency Data System."

DOA - Play the super-awesome Dead Ops Arcade minigame.
3ARC INTEL - Unlocks all the intel in the game for viewing. CAUTION: Disables Closer Analysis Trophy/Achievement.
3ARC UNLOCK - Unlocks all levels and Zombie Mode levels.
ZORK - Unlocks Zork I: The Great Underground Empire (an incredibly great text adventure from 1980) which you can play on the console.
HELP - Gives you a list of commands to interface with the console.
DIR - Gives a list of audio files and pictures which you can open with the CAT command (e.g. CAT NoteX.txt).
WHO - Gives a list of login names for use with the RLOGIN function (but they require a password).
RLOGIN - Log in with username and password.
FOOBAR - Gives a strange message ("Fee Fie Foe Foo!").
ALICIA - Loads "Alicia", a virtual therapist.

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Login Information
At the cheat terminal, enter LOGIN and then the following login accounts and passwords to read various people's email. You can also use the DIR and CAT commands to view files after logging in. Note: Enter WHO to see a full list of login accounts.

Example: Character Name / LOGIN - PASSWORD

Alex Mason / AMASON - PASSWORD
Dr. Adrienne Smith / ASMITH - ROXY
Bruce Harris / BHARRIS - GOSKINS
D. King / DKING - MFK
Frank Woods / FWOODS - PHILLY
Grigori Weaver / GWEAVER - GEDEON
John F. Kennedy / JFKENNEDY - LANCER
Joseph Bowman / JBOWMAN - UWD
Jason Hudson / JHUDSON - BRYANT1950
J. Turner / JTURNER - PASSWORD CONDOR75
John McCone / JMCCONE - BERKLEY22
Lyndon Johnson / LBJOHNSON - LADYBIRD
Ryan Jackson / RJACKSON - . SAINTBRIDGET
Richard Helms / RHELMS - LEROSEY
Richard Kain / RKAIN - SUNWU
Richard Nixon / RNIXON - CHECKERS
Terrance Brooks / TBROOKS - LAUREN
T. Walker / TWALKER - RADI0
V. Bush / VBUSH - MANHATTAN
William Raborn / WRABORN - BROMLOW

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You can also enter the RLOGIN DREAMLAND command to login to an account with MJ12 access. Here are the logins and passwords for Mj12 access:

R. Oppen / ROPPEN - TRINITY
V. Bush / VBUSH - MAJESTIC1