What I find amazing is that all these groups have the same start up story... "I was a lonely mom on maternity leave with no one I could talk to or stay busy with". I am also a part of a "home made" mommy group that seems to be growing everyday, how exciting! It's really important to stay connected with other moms who are going through the same thing as you. It makes you feel like you belong and a great way to make new friends too.
Let me know if you know of other resources, I can add them to the list!