DS started day care in September at age 17 mo. At first, I was insistent about getting him into an in-home situation. I had this notion in my head that day care facilities were impersonal and rigid. After visiting several in-home DCs, I started to change my tune. So many of them had homes that were not as child-friendly or child-proof as I'd have liked. They were all licensed (I wouldn't put DS in an unlicensed place, unless it were with a close friend or a family member), yet they just didn't seem, well, as comfortable as I thought one's home should be. SO we went the other route. We did find several that fit my original perception of a large-facility place, but we ultimately settled on one that I LOVE. DS comes home daily with a paper report of EVERYTHING he did that day. When he slept/pooped/arrived; the songs he sang; the books he read; the art/gross motor/fine motor activities he did; and a comments such as: Jude had fun pushing the shopping cart full of food today.
I concur with the PPs and all the things they suggest, but this one I'd recommend highly if you can find it: our day care has webcam. The picture is not crystal clear and there is no audio, but there is something very comforting about being able to log in to the site for 30 seconds during my work day just to see what he's up to. It is also reassuring knowing that even if I'm not always looking, the teachers have to behave as such. We pay a little more for this place than some others in town, but it's been worth it!