I managed to get unread posts to change by adding color: #660000; to the code below in threadlist.css
Code:
.threadbit .threadtitle_unread {
font-weight: bold; color: #660000;
}
--------------- Added [DATE]1339777747[/DATE] at [TIME]1339777747[/TIME] ---------------
once a thread has been viewed, it reverts back to the default color. However, if a reply is made to the thread, it does not go back to unread. Should it?