So... why do i NEED dual core?

The simple fact of computers at the moment is that millions of new buyers are getting way more computer than they will ever use. The PIII was all we needed for office work, web browsing, and email checking. If you don't encode something or other, compile stuff, photoshop, play games, etc. then it's pretty much a waste.
 
Man, it only took me under an hour to convert/burn a movie. My old machine took 3+ hours, lol

And wow, let me tell you something, video games on an up to par machine are sooooo much better. I can actually see when I die now! Its not 10 seconds of silence, a twitchy leg and then a body on the ground, wooooot, haha