I was looking for a way to enable and test Pingback/Trackbacks on my WordPress blog. I fount a great article that explains how the thing works and also allows you to test it. It is very well explained and I am using it right now to test it, here is the link: WordPress Trackback Tutorial

And actually, I you can also test your Trackback/Pingback using this blog post. I will accept any Trackback/Pingback, as long as it is not spam. However, it may take up to 24 hours for me to approve it, so just be patient

And if you need to be convinced that Pingback/Trackback are important to your blog, here is a great article that explains why: Link Marketing: Pingbacks vs Blog Comments