Normally I would say don't wait, as there is always something better right around the corner. However, there is so much new technology coming right around the corner that you can only win by waiting.
If the Palomino, nForce, and Tualatin are not as good as advertised, then go with the latest Athlon, as it will be less expensive then it is today. But the nForce is supposed to boost Athlon performance by up to 20%, and is worth waiting for the reviews. The Tualatin is the Intel choice that will finally come close to the Athlon in performance (except for its weak FPU), but will probably be priced right out of the market.
I was going to upgrade my old Pentium 200 mmx this month, but I will wait until October to see all of the new offerings. Price/performance will dictate my decision.
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