There's also www.canadachildcaredirectory.com. Check your local online options too. Sometimes there are local online advertising sites. Also, take a flyer into your local schools. In addition, something I've found very helpful, is having a proper website done up. You can link to it right from these daycare sites. I've just moved and am starting from the bottom, but had managed to stay full, or nearly full for many years in my old location. Since setting up my website a few weeks ago, I've had 8 interviews with one signing, so it does help with exposure, professional appearance, etc. Most of my interviews commented on the website and that no one else had one. Also, if you can get some testimonials from watching kids in the past in some capacity, that really helps as well. It just gives you a leg up over other providers as not many have testimonials....at least my interviews were impressed. Be sure to copy your testimonials to store in a file. When you're full and remove your openings from this site, your testimonials will vanish. I've also snagged a client or 2 just by being out and about with the daycare kids and striking up conversation. It's a good idea to have cheap business cards done up for these instances as, of course, you never have a pen when you need oneBut the top of the list is absolutely the website. If you know someone who knows how to do it properly, he/she might also know little tricks so yours comes up first in a google search. Definitely look into that.
Good luck!