For many kinds of analysis, simply copying and pasting the Google Analytics tracking code into your site is more than enough. But there's a growing population of Analytics power users who want fine-grained control over their site tracking and who have a burning desire to understand and manipulate the behavior of Analytics. For those of you, we now offer Google Analytics on Google Code.
Google Code has information on everything you need to know to create a custom Analytics installation on your site. Do you want to change the longevity of your marketing campaigns? Or add a new search engine to the list of those Analytics recognizes? How about configuring tracking to use both Google Analytics and Urchin Software from Google?
Google Code addresses your most technical questions; it's not intended to replace the Help Center. And our Authorized Consultants are always around if you have custom tracking requirements but don't have a Google Code level of expertise in-house.
Link - from Google Analytics Blog
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