It's pretty uncommon to list this info and grades don't matter. I really wouldn't worry about it much. I've interviewed at plenty of companies and been an interviewer at a couple of them (I'm doing an interview tomorrow actually) and never once have I heard anyone ask about grades.

Also, your resume is supposed to cast you in the best possible light. Once you get the interview no one will look at it. A resume reveals how good candidates are at self-promotion more than anything, so I skip right over it without even a glance and ask candidates questions which will reveal if they're bright and know how to write software.

I disagree. I interview people on a regular basis and I have never even considered thinking about asking them about their grades. All I care about is the ability to answer our interview questions. ("But what if someone's not good at reversing a linked list on the whiteboard," you say? Then they can work somewhere else.)

As someone who didn't have particularly good grades, I've been in this situation. In about eight job interviews, only once did someone show surprise when I told them my grades. Its as big an issue as you make it.