Well, for personal use, how about the Dual Opteron SFF?
[link|http://www.iwill.net/zmax/zmaxdp_1.htm|Dual Opteron Small Form Factor PC from Iwill]
Very interesting for a personal workstations.
It'll be interesting to see how the 8-way Opteron servers affect the server space (especially if Dell stays Intel-only). I also wonder how much the motherboard affects performance. Tyan has a $1600 quad Opteron motherboard; it'd be interesting to see how it compares to HP's quad Opteron.
Tony