Dual Cores are the ineveitable future dude, single cores have reached their peak as they continue to rise in heat without gaining the ability to sustain the excess temperature gained.Dual cores are a good idea, and a step in the right direction. But, i honestly dont ever see it being benificial to anyone except maybe some scientists that need to crunch numbers. I see the 4gb/s bus bandwidth being a major issue in the near future. Obviously they can just design a new motherboard.. But, AMD doesnt write its own motherboard chipsets/specifications. At least they haven't in the past. If it doesn't flop and get pulled in the first 3-4 years, it will eventually replace current home pcs. Dual cores are before their time.
Dual cores are only the beginning, Quad Cores will be the next big thing followed by god knows what, 16 core processors?
Read this and this for more info.