Well, you can get an adapter that splits a computer speaker style cable to the Red and White audio cable, it's a Y-Adapter. I have one and I use it to connect my laptop to my sound system.

Your computer can play Halo 3 if its good enough since they will clearly come out with a PC version like they did with Halo1 and 2.

I like all three of the next gen. consoles. They are all appealing.

"why I've gotta be one of the cool kids just to walk by/
- without being tripped, thrown down on the ground and kicked/
Insulting me for no reason, I was treated like shit/
The teachers let it happen/
I've even seen some of them teachers laughing/
That's why I had a smile on my face when I started blastin/" - Ill Bill - The Anatomy of a School Shooting