This is not even a fair question anymore. AMD is kicking Intel's ass in every aspect. Even Dell has agreed to use AMD's chips. The cost/benefits is simply better with AMD.
I am AMD & Intel, whichever is better at the time. I upgrade my PC every 3 years and my current one cost me $4,000AUD. It's using a AMD X2
I think the intels are the ones with heat issues. AMD atm is better for gaming but test have shown that the new Intel Conroe beats the best AMD FX-62 AM2 by margins lik 10+ % (off the top of my head) heres some new benchmarks http://www.hkepc.com/hwdb/x6800vsfx62-10.htm