If you've root access to your blog hosting then the simplest way to do a 301 redirect is with this line in your htaccess file: redirect 301 /oldpath http://newdomain.com/newpath Code (markup):
There is a Free plug in called "Redirection" that will do this for you. Just look for it on WordPress.org. It does a great job. Happy Birthday I'm feeling generous: http://wordpress.org/extend/plugins/redirection/