Will the publication of this list aid the pro-choice position, or the pro-life position?Probably the pro-choice position, which is why pro-life groups are up in arms about it.
I thought the consensus was that abortion should be available, but rare. This is basically an advertisement saying that "abortion is okay". Not a last resort, but a common, acceptable practice. These women are saying, by signing the petition, that they are unashamed of killing their baby.
Even most pro-choice advocates would say that abortion should be a last resort, not a first resort. I think any decision to have an abortion should include a reluctance and a small bit of guilt that the person had no other options. To say that you are proud to have had an abortion is just disgusting.

I understand that there are reasons to choose that option, but the choice should not be made with pride for goodness sake.
From the MSNBC article:
QUOTE
Jones said she got an abortion 10 years ago — enduring harassment from protesters when she entered the clinic — in order to finish high school. She went on to become the first member of her family to graduate from college, and hopes at some point to attend law school.
“I wanted to do something bigger with myself — I didn’t want to be stopped by anything,” she said in a telephone interview.
This kind of thing makes me sad. She saw no alternative to abortion? The selfishness of here decision stands out starkly. I understand her decision, but for God's sake have some humility. Have some remorse that you chose yourself over your unborn baby.
QUOTE
Another signatory, Debbie Findling of San Francisco, described her difficult decision last year to have an abortion after tests showed that she would bear a son with Down syndrome.
“I felt it was my right to make the decision, but having that right doesn’t make the decision any easier,” she said. “It was the hardest decision I’ve ever made.”
At least this woman acknowledges that the decision was "hard". But the fact remains she killed her baby not because she didn't want a baby or didn't have the means to provide for it, but because it wasn't perfect.

God help her if her mother develops terminal cancer or Alzheimer's.
QUOTE
Findling, 42, is married, with a 5-year-old daughter, and has been trying to get pregnant again while pursuing her career as a philanthropic foundation executive.
She says too many of her allies in the abortion-rights movement tend to minimize, at least publicly, the psychological impact of abortion.
“It’s emotionally devastating,” she said in a phone interview. “I don’t regret my decision — but I regret having been put in the position to have to make that choice. It’s something I’ll live with for the rest of my life.”
This woman doesn't say why she had an abortion, despite the fact that she wanted to have another baby. Her attitude is the best, however, with an acknowledgement of the difficulty and the emotional burden that women who choose this path will have for the rest of their lives.
The point is that when the social stigma associated with an activity is lessened, incidence of the activity increases. Here we have women saying it's okay to have abortions. They don't talk much about the long term issues, especially emotional, that are involved.