While the faithful await the AM3, Fudzilla seems to think they will be let down in terms of Price/Performance.
According to Fudo, the AM3 on an AM3 board with the current BIOSes out will not give enough of a performance boost to warrant the extra cost of DDR3. He says that even with tweaks to the BIOSes there will only be a roughly 5% performance gain using an AM3 board over an AM2+.
Does this bode well for AMD? In the end I do not think it will matter. The AM3 CPUs will run happily in an AM2+ board with DDR2. This means that some will buy them and run them in current boards waiting for DDR3 prices to drop.
Others will not buy AMD anyway as they cannot compete performance wise with Intel's current and even last generation CPUs, even if they do have a price advantage.