So how exactly do you know how many backlinks you have? Or links going into your site? Is that the same thing?
Go to yahoo and search link:yourdomain.com Signup to Google Webmaster Tools, attach a sitemap and you'll see the backlinks within your account.
You can check your backlinks you have on each SE by typing on its this command on its surf bar - link:www.website.com You can check your overall BLs using backlinkwatch.com (its very effective!)