Hi!
Currently, Mondrian works only on Pharo (I do not have much interest in seeing it in Squeak, even though I am not against). Should Mondrian use Grease? I have the feeling that we should not over-engineer Mondrian based on an assumption that is not verifiable currently (that Mondrian will be ported to a different Smalltalk).
I will remove from Mondrian all reference of Grease.
Cheers, Alexandre
[*] http://blog.fitzell.ca/2010/01/easing-compatibility-with-grease.html