What Intel’s flagship Core 2 Extreme Quad Core is good for?
That is the million or should I say billion dollar question...

It's kind of crazy already. There has not even been time to write or re-write code, or programs that take full advantage of dual core processors. Now we have quad core. Just as I said before, the benefit of these processors DO NOT outweigh the benefit of the technology at this point in time. Until there are programs that can take full advantage of this technology, these chips will be doing there best in the bragging rights departments. So do yourself a favor, especially if your a gamer or someone who doesn't multi-task and snap up some great deals on single or and "lower line" dual core chips.

While attending Intel’s Developer Forum in San Francisco this September, we were given one hour to do some rudimentary testing with Intel’s Core 2 Extreme Quad Core QX6700, their quad-core processor code named “Kentsfield.” Although we didn’t draw any hard conclusions after our brief testing, it was evident that there would be significant performance improvements depending on the applications being utilized. Now that we’ve had the CPU on our test bench for almost a month we think we have a good handle on just what Intel’s flagship Core 2 Extreme Quad Core is good for. We have been using it daily for our own applications, not just for benchmark purposes, and have gotten a very good feel for the hardware. For discussion purposes here, we will refer to this new processor as the "Core 2 Quad" in order to simply things a bit.

Thanks to Intel for actually giving [H] Enthusiast time enough to use the processor instead of just enough time to benchmark it.

Read all about it here, courtesy of hardocp.com:

-Eric