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Thanks Nicusor: Works great. I was able to change the width of selected columns on the Posts panel (e.g Title, Author, Categories) with your solution as follows:

add_action('admin_head', 'my_admin_column_width');
function my_admin_column_width() {
echo '<style type="text/css">';
echo '.column-title { text-align: left; width:200px !important; overflow:hidden }';
echo '.column-author { text-align: left; width:100px !important; overflow:hidden }';
echo '.column-categories { text-align: left; width:100px !important; overflow:hidden }';
echo '</style>';
}