Yellow pages - it was the last place I thought to look but this is how I found our perfect care situation. Before that, I followed up on classified ads on kijiji, craigslist, posters at the grocery store, online directories, that sort of thing. I even knocked on doors of houses that just looked like they might be daycares (I was usually right!), or googled the address to see if I could find a phone number or other info.
When searching like this, leave no stone unturned and go visit every place you can even if you get a bad first impression of their ad or phone manners. The biggest lesson I learned in looking for daycare is that the perfect situation for your child may come in the most unlikely form and situations you might have thought you'd be totally opposed to can in fact turn out to be perfect. I found it to be a stressful and exhausting exercise but humbling experience... in a very good way.