Sometimes we go to fast and don't take the time to explore all available options. Just little tip here...
Take a look at this new ADMIN option called "Google Analytic". I used to edit the skin or even use a custom module to add analytic for my sites. Now the option is included in the ADMIN control pannel and it's so easy to use... Open your Google Analytic account, for you or your client and juste paste the code in the field and your're done.

I know it's very easy but the tip was more to say, hey ! It's now there, than to show you how it work.
Thanks DNN 5,2,1 :) !