After writing about various tools on online analytics, a good favorite is Clicky from http://getclicky.com/
It is recommended especially to WordPress users because it has a customized WP Plugin (which means all the fun without any of the code), has an affiliate referral program (it’s a tough economy !) and can help you track individual visitors with a great deal of analytical value.
You can view the www.getclicky.com site for their own benefit list.
Short of actually building a click stream capturing application (which is quite useful for tracking and building models for web mining), clickstream data is extremely helpful in generating insights as it is at a record /visitor level and can be sliced /diced and viewed for your custom insights.
As for building automated models using web data, their is another software from Kxen (www.Kxen.com). They have been around for some time , though losing out on a couple of big chances , but their web scoring module is definitely worth a dekko.