I for one would run a clawhammer an linux just so I can use the 64 bit nature of this chip.
I think Sun Microsystems is saying pretty much the same thing. We haven't seen an anouncement yet, but the way Sun's aligned (or should I say mis-aligned) themselves with Intel, AMD may end up gaining a valuable OEM. Especially the way Sun has recently embraced servers running Linux. AMD chips have traditionally be viewed as Linux friendly. Especially considering that Linux was one of the first OS's to port to x86-64.
As far as Yamhill is concerned, I wouldn't be surprised if Intel has been quietly researching this option since AMD first announced their intentions with Hammer. The full force of Intel is quite considerable, and it would likely be the fastest chip ever brought to market. How Intel will choose to implement 32/64-bit operation will quite interesting...especially if they have to license x86-64 from AMD.