Hi Guys, We had the problem: to track activities on server side with PHP. The original Analytics tracking codes provided for client side only and we needed a PHP side script. I found a solution and it works quite good: http://code.google.com/p/php-ga/ If you have the same problem try it!
That looks neat! If you're looking for a more integrated solution, you could try out Piwik. It gives you full control over the databases and such and so it's a lot more flexible.