atx dual processor server motherboard

[adler-wRvlPVLobi1/31tCrMuHxg at public.gmane.org (Stephen Adler)]

Guys,

I'm poking around the web looking at a possible upgrade to my system. 
The Xeon 6 core processors are looking attractive and a dual motherboard 
with two of these, along with say 24 gigs of ECC memory would work 
nicely for me. The only drawback is that I have an ATX case which I 
spent way too much money on (its a Z Machine case) and I don't want to 
"throw it away."

So I've been searching for atx sized dual processor server mother boards 
and found one from super micro which looks to fit the bill. But I'm a 
big Intel fan, (don't ask...) and I'm having a hard time determining if 
Intel sells an atx dual processor server mother board. Intel search 
engine doesn't seem to be up to it. Does anyone know if any one of there 
Xeon 56xx series server mother boards comes in an atx form factor?

Anyone have any server mother board preferences?

Thanks in advance.

Cheers. Steve.