These two plugins basically do the same thing, but I wanted to keep them seperate. When you turn one on, it will automatically place either all NEW trackbacks or all NEW pingbacks (depending on the plugin) into the comment moderation queue. It’s meant as a simple way to keep the spammers from getting these onto your site without you first approving them.
Note: This does not do anything for all of the old trackbacks/pingbacks that have already been added to your site.
More information on the WordPress Plugins page.