Here is a cool trick I have implemented across the EWEA web platform:

<script type="text/javascript">
 var _gaq = _gaq || [];
 _gaq.push(['_setAccount', 'UA-xxxxxxxx-yy']);
	_gaq.push(["_setDomainName", "none"]);
	_gaq.push(["_setAllowLinker", true]);
	_gaq.push(["_trackPageview"]);
 _gaq.push(['_setAccount', 'UA- xxxxxxxx-zz'']);
	_gaq.push(["_setDomainName", "none"]);
	_gaq.push(["_setAllowLinker", true]);
	_gaq.push(["_trackPageview"]);
 (function() {
	var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
	ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
	var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
	})();
</script>

This goes at the bottom of the tags and what it does is this:

• The “yy” code is for the local site, i.e. our individual event site or our blog.
• The “zz” code is common on all the sites. This gives me a global view over all the sites as to the most popular content across all platforms.