Dear Katie,
For those who are interested in, this MNI template in MRIcroGL is a modification of the ICBM 152 2009b Nonlinear Asymmetric version with a voxel resolution of 0.5 x 0.5 x 0.5 mm^3 (as described in the COPYING.TXT in MRIcroGL), the orginal files (T1, T2, PD weighted including skull) can be obtained from http://www.bic.mni.mcgill.ca/ServicesAtlases/ICBM152NLin2009 . You shouldn't really rely on them if you haven't used them for preprocessing, but for popular press it should be okay ;-)
Best
Helmut