1. You might delete the php call to the right sidebar, as it's still showing up:
<div id="left_sidebar">....
check your page source, then open single template, find this line and delete:
<?php include(TEMPLATEPATH."/left_sidebar.php");?>
also in all other page templates
2. You might fix your 404 page: giraffe3d.com/wp-content/themes
3. You might fix the image replacement for the h1 tag, it's too much height. Just click on your logo to see it.
4. Search gone? Usability? Accessibility?
Unless you want the site to be your private playground, then it might be a good point to work on usability and accessibility.