AMD All the way! Althogh Hyper Threading processors run good in applications that take advantage of multi thread (which means that 98% of the world doesn't care about HT), it still runs too hot, and its too pricey. Besides, P4 are way too tweaked to be able to compete with the more cheaper/ cooler/ advanced/ faster/ smarter and just capable AMD processor. Come on guys, don't the 777 flies faster than the A340, and the A340 has 4 engines. So does AMD. With less MGhz, but with its excellent desing, it outperforms Intel's offering.
BTW, remember that AMD has been selling its AMD64 for more than a year now. Intel had just started to sell its Pentium D line which include 64bit extensions, but nothing like the AMD 64.
And for those of you who are still with Intel and think is great, that is because you haven't tried an AMD processor (or that you're using a HT enabled application).