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We have been using the WordPress mobile pack plugin (http://wordpress.org/extend/plugins/wordpress-mobile-pack/). We have been using the WordPress mobile plugin and it’s possible to set as a sub domain m.site.com, sub directory site.com/m, different URL site.mobi / or same URL but the User agent switches the WordPress theme being used. In theory if the content is slightly different it would be better to use a sub directory rather than a different domain,  and where the content it the same the same URL could be the best answer, but haven’t found a definitive answer on that. It also seems from google’s how to go mobile site that mobile pages can have the same Meta information and do not require a canonical link. http://www.howtogomo.com I think references to googlebot-mobile are for how google crawls content for feature phones e.g. wap pages, but not sure if this applies to googlebot-for-smartphones which is still quite new and it’s possible to set as a sub domain m.site.com, sub directory site.com/m, different URL site.mobi / or same URL but the User agent switches the WordPress theme being used. Thanks!