Intel unveiled the quad-core early by almost a month. Good news for tech-buffs. Core 2 Duo will come cheaper, that's better news for everyone.
Why quad-core? I serious don't know unless you have large reserves of cash to burn. Few apps are optimised to fully utilize dual-cores to run efficiently. Even fewer uses quad-core. So for now, if you just have that itch in your bottom, go grab one off the selves, at a premium.
Though i'm not pro-AMD, they will come back hard and competition is great for us.