WordPress.org

Author: Libin Pan and Michael Klein

The Google AJAX Translation WordPress plugin provides a quick, simple and light way to add internationalization feature onto your blog.

Be sure to start here:

Google AJAX Translation WordPress Plugin V0.2.0

and

Google AJAX Translation WordPress Plugin

In the current version(0.3.*) I only enabled comment translation by default, but you can enable post translation yourself from the admin page. And please keep this in mind: Google Ajax Translate only allow 500 characters right now (March 2008).