That one is easy, you integrate PCIe onto the chip. Latency for just about everything takes another huge whack, and everything from video to 10 GigE gets faster. For the home, you get more frames and better graphics responsiveness. For the business world, you get latency reduction on I/O, latency reduction on I/O, and latency reduction on I/O as the three most important things.
If you were wondering what all those pins on S1207 were for, wonder no more. If you need I/O that scales with the number of CPUs, look no farther. If you want this from AMD, it will happen. If you want it from Intel, it will happen too, just 18-24 months later, *COUGH* Nehalem *COUGH*.
This one is a clear win for AMD, or it will be when it comes out. Other than pins, and the associated cost, I really don't see a down side. You can always add more lanes with a HT based controller if you feel limited, but AMD would probably prefer that you add CPUs.
Don't count Intel out though, there are more than enough *T's coming down the pipe to keep them in the game. Look for some this coming IDF, and another tomorrow. ยต