The Inq reports it will still take a while before DDR3 memory will reach desktop computers. Probably it will take until late 2007:
Intel just released its Q965 chipset and made its own mind up and said that DDR 2 up to 1066 is good enough, while AMD also supports DDR 2 up to 800MHz officially, but it can overclock much higher than that.
The Dramurai still has to earn the money from DDR 2 so the firms won't move that soon to DDR3. Intel's next chipset is scheduled for middle 2007, roughly a year from now and this is the right time for the birth of DDR 3 chipsets for the masses.
Currently it looks like DDR3 may be launched at 1066MHz (PC8500).