Quad Core. Is it worth it?

What is a quad core? It is a processor with 4 cores that work with each other through technologies created by AMD and Intel.

Here is a list of the Current Processor's at the time of this post:

AMD Phenom:
9500
9600
9600 Black Edition
9700
9750
9850 Black Edition
9900

Intel Core 2 Duo*:
Q6600
Q6700
Q9300
Q9450
Q9550

*Excluding the Intel Core 2 Extreme Edition Processor's

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