My newslet­ter from Yelp had some inter­est­ing num­bers in it today.

Though we don’t stop to think about much it, sites like Yelp, Gig­Park, Google Biz and even Foursquare are a great resource for qual­i­fied leads.

They sit on a con­tin­uüm of use­ful­ness that ranges from a mod­ern ver­sion of yel­low pages to read­ing your mind.

Accord­ing to Yelp,

27% of all Yelp searches come from our iPhone Application.

Last month (May), over half a mil­lion calls were made to local busi­nesses directly from Yelp’s iPhone App. That’s about 1 call every 5 sec­onds to a busi­ness as a result of Yelp.

Nearly a mil­lion peo­ple mapped door-to-door direc­tions to a local busi­ness from their Yelp iPhone App last month.

And these are only the iPhone num­bers. (Don’t for­get, we’re on Android, Palm, and Black­berry as well!) In addi­tion, Yelp’s mobile traf­fic is only a frac­tion of our total traf­fic. Over 32 mil­lion peo­ple vis­ited Yelp from desk­top com­put­ers in the last 30 days.

That’s a lot of peo­ple. Even if you don’t use Yelp your­self, chances are you’ve googled some­thing and had a Yelp list­ing come up.

Per­son­ally, I’ve been log­ging on and using Canada411​.ca for years instead of clut­ter­ing my small house with big phone books.

And the last time I was north of Toronto proper I found the best Szechuan I’ve had since I moved here 14 years ago using Yelp.

I’m not sure any­one has an excuse not to spend the time it takes to fill in your pro­files in these places (or have some­one do it for you). Some of them even let you make an offer to prospec­tive cus­tomers for free.

What ser­vices are you using?