If you are a blogger and looking for direct advertiser on your blog check your outbound link first, most direct advertiser wants a blog with less than 20 outbound links. Outbound links are the links going out of your website/blog means pointing to another site.
If you have a link-exchange program with other bloggers it is advisable to create a page for it rather than creating a link farm on your sidebars.
To check your outbound link you can use this tool from seochat.com
or you can use Search Engine Optimization