Thanks for posting.

I'm certainly interested - I maintain the nibabel python image library, and we would very much like to be able to validate our conversions in this way - particularly for DICOM.

The MIDAS system has some DICOM datasets : http://www.insight-journal.org/midas/collection/view/192

The BIRN data license looks pretty locked to BIRN - is there any reason for that?  I would much prefer a license that allowed flexible redistribution. 

The Reproducible Research Standard suggests CC-0 for data :

http://www.stanford.edu/~vcs/talks/Victo...
http://academiccommons.columbia.edu/down...  

Cheers,

Matthew