As Jim said, they are trackbacks.
If you are using wordpress like the site in the OP you can do the following.
http://www.smashingmagazine.com/2009/07/23/10-wordpress-comments-hacks/
Read point 2 on that article to seperate pings and trackbacks from real comments.
If you are using wordpress like the site in the OP you can do the following.
http://www.smashingmagazine.com/2009/07/23/10-wordpress-comments-hacks/
Read point 2 on that article to seperate pings and trackbacks from real comments.


*points at nearest mod*