If you want to contest a homework score, do so within one week of the date on which the graded homework was handed back. You must complain to Ke Wang and Jon Ludwig, the grading czars. Please make sure that you've carefully read both the solutions and the notes on grading before you make a complaint.
Update: Homeworks submitted for regrading must now be accompanied by a written statement that details your concerns.
Special case: Thursday, May 17 was the deadline for HW14 regrade requests.