http://www.3dnet.hr/dr-ice11-en-01.html
This guy is claiming some pretty good numbers, but as usual his testing methods are rather primitive.
Is it possible that some form of direct-die cooling could match the performance of some of the top blocks out there now? I know it has been tried a couple times here, but I don't think we've ever seen definitive testing (due to the fact nobody can really test direct-die setups yet).