This may be belated, but I'm thinking of applying for mentoring a garbage collection project for GSoC 2011. I think GC quality of implementation is one of D's biggest weaknesses and one of the areas I know most about.
I can't seem to find information about time commitments in the GSoC FAQ or how to apply as a mentor and have not been following the related threads closely. Does mentoring just consist of spending a few hours a week corresponding with the student, i.e. providing feedback, answering questions, etc., or does it require a major time commitment?