Thanks to Sir Wilson Chua for this tip.

To find out what pages Google has already indexed in your site, type the following on the Google search box (whether via Google toolbar or Google.com):

site:*.yourdomain.com www

Of course, replace yourdomain.com with your URL. For example:

site:*.awbholdings.com www

For sub-domained sites like Blogger blogs, replace * with your blog URL. For example:

site:geekyguide.blogspot.com www