Still one of the nicest except …

This plugin does the best and most comprehensive job of all the similar ones I tried. You do have to watch it like a hawk every time you update it to keep it honest if you are not wanting sharaholic affiliate link rewrite features.

It has one fairly major flaw that I knock off a star for. It adds share buttons to custom post types with no way to prevent except checking boxes on every single custom post individually. Fortunately there is an easy fix. Add the below code to your theme functions.php (or your own plugin if you want to be theme independant). You can modify the post_type test to suit your needs. Mine are to only have share buttons on post and page types.

add_action('the_content', 'sharaholic_fix_types', 1);
function sharaholic_fix_types($content) {
	global $post;
	remove_action('the_content', array('ShareaholicPublic', 'draw_canvases'));
    if ($post->post_type != 'post' && $post->post_type != 'page')
    	return $content;
    return ShareaholicPublic::draw_canvases($content);
}