there are many plugins to let you do this. you can also use htaccess to rewrite all your /wp-content url to cd.
but i just found out, you can do it very easily without any plugins or htaccess rewrite. just edit your wp-config.php like this:
define( 'WP_CONTENT_URL', 'http://your.cdn.host/wp-content'); define( 'WPMU_PLUGIN_URL', 'http://your.cdn.host/wp-content/plugins');
that's all it.
now all your wp-content and plugins url will be change to your.cdn.host and no cost for htaccess rewrite or plugins processing.
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