Hmmm....
http://www.hardwarezone.com/news/view.php?id=11521&cid=![]()
Nehalem and X58 are looking very good right now...
Quad Core i7, 24 GiB of DDR3, SLI, hmmmmm.
__________
Maybe we'll see the single socket Mac Pro Junior - the fabled mini-tower soon!
Here's a dual cpu version from Supermicro:

Tylersburg workstation board
The first two were very similar, the X8DT3 and the X8DT3/i pictured above. The former has two sockets and an Intel IOH-36D chipset (aka Tylersburg). It will support three PCIe 2.0 8x slots, one physically 16x, and a lone 4x as well. There are eight LSI-based SAS ports, six SATA, dual LAN, VGA, six USB and optional KVMs.
If you lose the KVM and add in two full 16x slots instead of three 8x, you have a good idea what the /i variant is. The base board is for servers, the /i is for workstations. /i also loses the SAS ports, you can see the blanks on the lower left, but other than that, it is basically the same thing.