I agree, Meetup.com is a great site. I belong to the Meetup atheist group in my city, but unfortunately most of their events are not toddler-friendly, which is why I started the site - to try to meet other nontheist parents. I considered starting my own meetup.com group just for local parents, but they charge (at best) $120 per year and I just couldn't see putting up that kind of cash when there wasn't really that much interest in regular family oriented activities in the local group that was already there.
So, since I had the webspace anyway I started the site that I accidently spammed everyone about. The good thing about it is that it supports all local nontheist parenting groups. It can be used as either a directory to existing groups, or as a way to directly meet other parents. So if you want to get a little more free publicity for your own group, please go ahead and sign up and post a note about it in the proper local section. :)