How to find who links into a website

1. Google Webmaster Tools -- "Your site on the web": "Links to your site" screen.

2. Google search for "link:webdevelopersstudio.com" (narrow) or links:webdevelopersstudio.com (broader)

3. http://altavista.com/web/webmaster

4. http://www.alexa.com/site/linksin/example.com