Santa Fe is decently family friendly, though not nearly like my midwest upraising. The libraries have some decent story hours, as does Borders downtown. Bicentennial pool (on Alto St) is wonderful for little ones - it's open for another week or two - and the Chavez Center on Rodeo is great all year long. There has been a pretty decent concert schedule this summer (on the Plaza) which is fun for families. The Children's Museum is wonderful, as is the Folk Art Museum. I think I mentioned Moms Club in my earlier post. They have at least two active groups here in Santa Fe. All of these activities should be helpful in meeting other moms. Oh, there's a very busy park where you are always sure to meet other moms that is on St. Francis and Alta Vista. It's nicknamed the "Train Park" as there is an old train engine in the park.
As I mentioned, most get-togethers are casual, and sometimes the best way to meet others is just to introduce yourself at the park, story hour, grocery store, etc. There are some great music programs, too. I'm most familiar with one called Fam Jam (famjam.net) which I loved going to so much with my son, I've now become certified to teach. I met several people there.
I'll send my phone number to you privately - please feel free to get in touch with me. Good luck in Santa Fe!