It bugs me that this gets so much news coverage when there's way more important things going on. Yes, it's sad and dramatic but it's not very important.
That said, I think the jury didn't make the wrong choice. That's not to say that I think this woman is innocent, but the prosecution didn't really show very convincing evidence (whether that's laziness on their part, or simply the fact that getting sufficient evidence is practically impossible, I don't know), and I think there was room for reasonable doubt, even with the mom's apparent happiness/apathy and partying. I can't know whether or not she's guilty of murder, but I think she should definitely be charged child neglect (if it applies in this case).