Thematic remove Author information from postheader (override example).

gistfile1.php

<?php
// reference http://thematictheme.com/forums/topic/making-minor-amendments-to-templates/
// reference filter example (same thing, different way to do it). I prefer the filter. https://gist.github.com/scottnix/5790774

// remove the author information from all posts using the child theme override functionality
function childtheme_override_postheader_postmeta() {
    $postmeta  = "\n\t\t\t\t\t";
    $postmeta .= '<div class="entry-meta">' . "\n\n";
    $postmeta .= "\t" . thematic_postmeta_entrydate() . "\n\n";
    $postmeta .= "\t" . thematic_postmeta_editlink() . "\n\n";
    $postmeta .= '</div><!-- .entry-meta -->' . "\n";

    return $postmeta;
}

// remove the author information from only categories using the child theme override functionality
// this is just an example of the above, but utilizing a conditional wordpress tag
function childtheme_override_postheader_postmeta() {
    if ( is_category() ) {
        $postmeta  = "\n\t\t\t\t\t";
        $postmeta .= '<div class="entry-meta">' . "\n\n";
        $postmeta .= "\t" . thematic_postmeta_entrydate() . "\n\n";
        $postmeta .= "\t" . thematic_postmeta_editlink() . "\n\n";
        $postmeta .= '</div><!-- .entry-meta -->' . "\n";
    }
    else {
        $postmeta  = "\n\t\t\t\t\t";
        $postmeta .= '<div class="entry-meta">' . "\n\n";
        $postmeta .= "\t" . thematic_postmeta_authorlink() . "\n\n";
        $postmeta .= "\t" . '<span class="meta-sep meta-sep-entry-date"> | </span>'. "\n\n";
        $postmeta .= "\t" . thematic_postmeta_entrydate() . "\n\n";
        $postmeta .= "\t" . thematic_postmeta_editlink() . "\n\n";
        $postmeta .= '</div><!-- .entry-meta -->' . "\n";       
    }
    return $postmeta;
}

Override Example - https://gist.github.com/scottnix/5790774
Filter Example - https://gist.github.com/scottnix/5790772

Both do the same thing. You only need one of these functions, the second function is a example of using a conditional to achieve different results depending on your needs, the above example retains the normal functionality on everything except the categories, which are set to not show the Author Name.