“Wow” is all I could muster the first time I saw it. I had to try it for myself. Installation was flawless and it was easy to get started.
It can be configured if you’re into subdomains or folders for your blogs, and if you’d like to use WPMU you can have each install support a different language. Management from the backend is robust as well, as you can choose different languages for pages, posts, tags and categories. Even the admin language can be changed.
If you’re interested in providing experiences for other languages, consider checking this out. I’d love to see someone completely rock this.