Thanks for all the input! I haven't heard of the Children's Garden, so I'll have to look into that.
We actually toured two of the other places y'all have recommended. The Atlanta Progressive Preschool (the one in the UU church) was *lovely* and I would recommend it to others, definitely. We only heard about it literally 5 days before their enrollment deadline and we weren't 100% sure that we wanted to send Evie to a toddler program next fall, so we decided to wait. So I'm actually researching this for the 2010/11 school year. (I know, a little early, but this way I get to take my time...)
Anyway, we also toured the Decatur Montessori and I didn't care for it. The toddler room was uninspired and stark. The toddler yard was a very small mulched yard with a couple of little-tykes yard toys. (The size of the yard didn't concern me as much as how boring it was.) The 3 - 6 rooms were fine, but just the state of the toddler room made me sad and we left.
The Atlanta Progressive Preschool had *great* rooms, you can tell that they really put heart and imagination into them. I loved the interactions I saw in the older classrooms, as well. (The toddler room was just, well, toddling.) We really did almost jump and sign her up for the school. I'm thinking that we might prefer a school that was pre-school through elementary, though, which is why we were looking at the Waldorf School. The Waldorf School has some fantastic qualities, and I love the nature focus. There are other bits to the general Waldorf philosophy that I'm not 100% on, however; so I thought we'd keep looking.
Thanks for the input, and any more insight is appreciated!