Nah. The AMD 3000+ may run at 2.0GHz but a) it has a shorter pipeline, which means it can flush it out and start again easier. This helps in all unpredictable tasks, like gaming for instantance. This is a draw-back though in predictable things like encoding, so like Lord Kalthorn says the Intel with it's longer pipeline will be faster, b) it does more tasks than the Intel per instructions, so basically it uses it's speed much better.
The 3000+ will give out less heat, therefore a quieter heatsink can be used, and uses less power, meaning you save electricity and money when buying a power supply. If you are looking at the new 6-series for the P4s, they are exactly the same as the 5-series just with 64-bit capabilities. Anyway, programs and operating systems won't be all 64-bit for quite a while, so 64-bit is just a pretty number at the end.
So personally I think a quieter, more energy efficent, better at gaming and hugely overclockerbly (especially if you wait until the Revision-E/Venice cores come out which will be even better than the Winchesters at this) and cheaper AMD Athlon 64 3000+ with a Venice/Winchester core would be a much smarter buy.
But then again, I am AMD mad!