Hi, I've just noticed that Google Analytics hat this specific _setDomainName() method (see: http://code.google.com/intl/fr-FR/apis/analytics/docs/gaJSApiDomainDirectory.html#_gat.GA_Tracker_._setDomainName).
I haven't found an option in UGA 1.6.0 to match the COOKIE_DOMAIN constant that we can set in wp_config.php (see: http://codex.wordpress.org/Editing_wp-config.php#Set_Cookie_Domain).
That would be really helpful to make http request to static resources stored in a different subdomain cookieless.