That comes from your skins/yourskin/_main.php file as part of the "request_title" function. You can make it not do titles on single post pages with a very simple hack. In that file find something very much like this:

<?php
   // ------------------------- TITLE FOR THE CURRENT REQUEST -------------------------
   request_title( '<h2>', '</h2>' );
   // ------------------------------ END OF REQUEST TITLE -----------------------------
?> 

Change it to this:

<?php
   // ------------------------- TITLE FOR THE CURRENT REQUEST -------------------------
if( $disp != 'single' ) {
   request_title( '<h2>', '</h2>' );
}
   // ------------------------------ END OF REQUEST TITLE -----------------------------
?>

Thanks EdB!

In my humble opinion it should be like this by default. I don't understand why the Title has to repeat it self twice. I guess there must be some use for it, but I don't get it.

Anyway, with your hack now it is like I want it.

Thanks again!