X2100 IPMI Redux - success!
In hindsight I should have thought of it, but even if I had, others got there first.
You may remember my problems with IPMI on our X2100 servers from an earlier posting. Today I had cause to revisit the matter, as we're having terrible issues with the Nvidia RAID on one of our servers.
The lack of a Windows version of IPMItool is still a pain, but I am leagues closer to a usable solution now, thanks to Cygwin. The solution, it turns out, whilst somewhat laborious, is fairly straightforward. Simply build IPMItool under cygwin. Result!
Instruction are available on the 'net and the IPMItool man page is on Sourceforge.
I can now query the SMDC board on my X2100s from Windows.