http://hackingthexbox.com/
How to hack the XboX

The Viper ushers in a new generation of mobile protection and reconnaissance vehicle, built to meet the rapid deployment requirements of today's security forces. The Cobra and Viper Security Vehicles provide a stealth platform able to respond with decisive fire power. Whether you are protecting a head-of-state, engaged in peace-keeping, or involved in low-intensity conflict, the Cobra and Viper Security Vehicles should be part of your team.
http://www.ibistek.com/security_vehicle.html

This is for all you MSN people

When in a conversation, if you type:

/patchou You get a picture of the creator, with the message: "Thank you for using this software. The best reward I can get for my work is to see you highly satisfied. Sincerely, PaTchou."

The other person must have Messenger Plus! To be able to hear the sound effects.

/sbrb You get "Be right back" in the conversation, and a sound clip of Arnold Schwarzenegger from Terminator saying: "I'll be back".

/sdoh You get "I'm so stupid" in the conversation and a sound clip of Homer saying "D'oh!"

/sevillaugh You get "Muahahahha" in the conversation and a sound clip of an evil laugh.

/skiss You get "I Love you" in the conversation and a kissing sound.

/shello You get "Hello you!" in the conversation and a sound clip of Mr. Hanky saying "Howdy how!"

and a few more hints

Here's an easy one. Just start chatting with someone and type the following characters to get the Hidden Emoticons to show up:

Rainbow: (R)

Handcuffs: (%)

Sunshine: (#)

Stupid Question mark: (?)

Screwy Face: :S

Devil (my favorite): (6)