Here are some websites with message boards for parents. Some of these do not have message boards but are great resources.

The Mommy Connection A great message board for moms
Parents Place This website has lots of message boards for parenting. Also, the CAR SEAT board here is a WONDERFUL resource for finding a car seat.

All About Babies A friend of mine created this site, so visit it. LOL
Mom To Mom
Real Mom
Parent Soup
Moms Online
Parenting Place
The Parent Club
Babies Online
Baby Bag
Adoption.com
Parenting Site
Mom.com
Parent Time
Pregnancy Today
Baby Today
CTW
Baby Net
Delphi You will have to do a search to find the parenting forums here
ABC Parenting
Baby Center
Twins A great website for parents with twins
Single Rose A great website for single parents
Daily Parent
Storksite

Medical Advice

These websites offer medical advice for children.
America's Doctor In my opinion, this website isn't worth the time I took to type it, but who knows it may be a benefit to you.
Web MD I hear this is a great website. I have been there a few times.