Have you lost a baby? If so, my heart and prayers go out to you. I know what you're going through, because I've been there. We lost our first baby, had our daughter (who is thankfully healthy, now a toddler, but the pregnancy was full of complications) and then we lost another baby in April of 2005. If you or someone you know are suffering this pain -- which is indeed one of the greatest emotional pains a human can withstand -- then know there are others who know your pain. Here are some resources I hope you'll find helpful.
BabyCenter has the most extensive community for grief and loss. The link in this paragraph will take you directly to the grief and loss directory, where you can choose the board that best matches what you are going through. I have found this such a supportive site, and can't imagine if it hadn't been available.
Saving Babies is an awareness website started by a friend and I about a more-common-than-doctors-will-admit problem of low progesterone. Check our links page for a variety of resources.
Recurrent Miscarriages is a good resource for searching for just about any type of problem that can cause miscarriages.
Great resource for women's health topics can be found here: OBGYN Forum. You can even ask questions and have them answered by doctors!
Troubledwith provides a place where you can contact a professional counselor for free if you need to.