Victorious Birth - for anyone who's experienced a traumatic birth!
Homebirth Reference Site (loads of good info, even if you aren't considering homebirth)
International Cesarean Awareness Network (ICAN)
Plus-Size Pregnancy (not just for plus-size moms!)
vbac.com - title says it all, doesn't it?
The Farm Midwifery Center
The Safety of Home Birth: The Farm Study
Agency for Healthcare Research and Quality
The Mother-Friendly Childbirth Initiative
Please let me know if any of these links don't work.