I am always looking for new ways to promote my clients websites. And sometimes 'regular' link building just isn't enough.
I mean, you can spend hours and hours looking at competitors and searching out new opportunities only to find that after you've spent these hours searching you have only come up with a couple of adequate links.
So as part of my job I look for those sources which could be ideal for links, which are easy to request and get and will help contribute to the site's overall link popularity because the links are high quality and relevant.