you have gotten some great advice.
One other thing I did was join a walking group. I am pretty sure the website was see mommy run (I don't remember the exact link). It was great - I met a bunch of new moms, we could actually chat because babies were in strollers, and I got out of the house and exercising. It is free - each group just e-mails and sets up meeting times and spots. Some of them meet indoors during the winter. I am still friends (two and a half years later) with some of the moms (the group has fizzled, but we still have playdates). I just wanted to mention it as it is free and a good way to meet other moms. They have groups in most states and cities - just look on the site, I haven't checked it in a long time.