John, thank you for your answer!
starting from Sitefinity 3.5, you may use DomainName and DomainExtension options for your multilingual web site. DomainName option will separate the localization by domain, for example it might be:
While the other option will enable different domain extensions for different languages.
Other than that, there is still no way to hide the query string or the path separator. We will consider an option for storing the language in a cookie or a session.
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.