I have been asked to do some research on boys and writing. I am looking into it, but in the meantime, I found this article on boys and school that gives some thoughts and ideas on boys in the classroom. Page 6 of this PDF file gives some help with boys and writing.
http://www.aimsmd.org/upload/SB-15-Costello-FidgetyBoys.pdf
Here is another one that has some interesting points:
http://www-rba.educ.cam.ac.uk/Paper%20EB.pdf