I haven't been on here for a while, I mainly lurk on the nest, but I thought I'd check in with the local board!
I noticed several people asking about playgroups/meeting new people, etc. I'm involved in a group called www.milwaukeemommies.com There is a calendar with lots of events from play dates at people's houses, family events, meeting at local kid-play places, etc. mainly in the waukesha, milwaukee, washington county areas. Also we're trying to branch out to racine/kenosha.
Its a nice an active group and we have lots of fun! There are mommies with one little one, two little ones, up to 4+ kids, all ages from newborn - ages 5/6/7.
Hope that helps.