I wonder why WordPress theme designers don’t implement this feature more often. Separating trackbacks from comments is a very simple tweak that will greatly improve the user experience for the people that comment or read comments on your blog. If you keep them together (as I used to until recently…) the readers will see a bunch of links and snippets of code mixed with the real comments, making it difficult to follow the conversation.
So how do you do it? You will just need to open the comments.php file and edit some lines. Michael from Pro Blog Design has a step by step tutorial for this purpose, and he allowed me to adapt it here.