>> I got 0.625 ohm by building a Ybus matrix (basically tells you the 
>> conductance between each pair of nodes) and inverting it.
>
> Right.
>
> Scott: 0.625 Ohms
> pyroman: 1.3141 Ohms
> hthall: 167294/195327 Ohms ( ~0.856 Ohms)
> phlip: 25265/33783 Ohms ( ~0.747861 Ohms)
> mu-zak: 0.77 Ohms
> EngPhys: 0.758 Ohms
> Kirby: 0.7479 Ohms
>
> So most people agree it's roughly 1 Ohm, but there's still a fair bit of 
> variation there...

:-) I never said I got the right answer, I just told you the simple way to 
calculate it (rather than trying to solve 100 simultaneous equations)

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