Hi, thought I'd let you know I was having trouble getting trackbacks to appear. I was receiving the "No Trackbacks." message on posts I knew had trackbacks. I did some searching around and found a solution that works for me [ I'm not qualified enough to say WHY it works though ;) ]
Solution: Add the following line of code before the IF statement in trackback.php
$comments_by_type = &separate_comments($comments);
I found the solution at this support page about comment_by_type problems
Anyway, thanks for the great plugin, looking forward to Twitter support!