Sub Domain Stats
cPanel has made an entire section devoted to nothing but sub-domains stats. This section is very useful for users that have a large amount of sub-domain names that they'd like to view the stats for. Simple go to this section and a list of all the sub-domain names within the account will be located here. There are a few different sections within this main page that a user can choose from.

click image for better view
Depending on what is available on the users account, determines what will be displayed in this section. Normally users will have access to the latest visitors, analog, and either Awstats or Webalizer; sometimes both.
Latest Visitors
The latest visitors section will display very useful information about each user that visits the site. This section of the sub-domain stats section can be very useful if read correctly. It contains allot information about the user and where they have been on the site and where they came from.
Example Output:

click image for better view
The first thing we can see is the hosts IP address. Next we can see what the user was accessing. In this case it was an image file “auobanner.gif”. There is also a good bit of useful information below this.
Http Code: 200 – This shows the code the server returned after the user requested the file or page. In this case the server returned a “200” code which means “OK”. So the user was able to download the file successfully.
Date: Feb 02 14:12:31 – The server will display the complete date and time, down to the second, of when the file accessed. This can be useful in many different scenarios.
Http Version: HTTP/1.1 – This basically shows the version of HTTP the server uses.
Size in Bytes: 60518 – This returns the size of the file that the user downloaded. Remember this is in Bytes and there are 1054 Bytes in every Megabyte.
Referrer: This is the location the user came from to access the file or page. This is also very useful information in tracking incoming links and so on.
Agent: This basically shows the “Agent” or browser that a user is using, it will also display the version windows the user is also using.
Analog – Webalizer or Awstats
These programs will format the “Raw Log” files so they are easier to read and understand. There is an enormous amount of information contained in each of theses log files and some will produce more information then others. It's very useful for a user to learn to read at least one or more of these statistic programs in order to track their users. Tracking users will help in the growth of a site and community.
More information on Awstats can be found here: Awstats Explained