If you look at the comments section of some of your favorite blogs you will probably see some comments that may look a bit strange upon first glance. I was curious as to what these comments are all about and I found out they are called Trackbacks and Pingbacks. After a little research (and by research I mean a quick Google search) I found a great site that explains both of them and even gives a little tutorial on them. Pingbacks, if enabled, are basically automatic after you change one setting in your blog. Trackbacks require a little more effort, but not much. Check out the whole post at http://www.optiniche.com/blog/117/wordpress-trackback-tutorial/