Here we go...
AMD is still on DDR, Intel went to DDR2 a while ago. AM2 will ship with DDR2 support.
In contrary to popular belief ("it has a 2, it must be better") DDR2 doesn't beat DDR that much. The expected boost from going v2 is about 1 - 5%, as long as DDR2-800 or faster is used. The older version, DDR2-667 is not as fast as normal DDR-400, when comparing timings and speed. It shows that AMD doesn't need the extra bandwidth, at least not until quad cores are around.