DIAMONDVILLE IS THE new desktop version of Silverthorne, that much is news to no one. The real question is what makes it different from Silverthorne?
It is quite simple, take a standard Silverthorne and swap out the Poulsbo chipset for a 945 variant, most likely the i945GM something for lower power and cost. The power is the easier part, there are two bins, 4 and 8W TDPs, so if you subtract out the 2W of CPU TDP, that doesn't leave much for the chipset. This means a really skimpy feature set on the southbridge, at least for the 4W SKU.
One thing it does do is lower the price. Digitimes has reported that Diamondville will be about $15 cheaper than Silverthorne, and that is probably caused by a mass-market chipset vs a specialized one.
Then again, list pricing is very different from OEM pricing, so who knows? In the end, it is just an Intel chipset. ยต