I was just checking out Google Local Canada and it's pretty cool. It's essentially your yellow pages on steriods, permitting you to search for any type of business in any locality. For example, here's a search on used book stores in Toronto. In addition to the phone number and address you get a link to their website and their location on a map of the city. What more do you need?
I actually don't keep a copy of the yellow pages around any more. It's a relic from yesteryear that's no longer relevant. Not unlike Rod Stewart...
