To discover key metrics about an existing SharePoint Server 2010 deployment, such as how many users are active, how heavily they are using the system, what kind of requests are coming in, and from what kind of clients they originate, it is necessary to extract data from ULS and IIS logs. One of the easiest ways to acquire this data is to use Log Parser, a powerful tool available free for download from Microsoft. Log Parser can read and write to a number of textual and binary formats, including all the IIS formats.
For detailed information about how to analyze SharePoint Server 2010 usage using Log Parser, read Analyzing Microsoft SharePoint Products and Technologies Usage (http://www.microsoft.com/downloads/details.aspx?familyid=f159af68-c3a3-413c-a3f7-2e0be6d5532e&displaylang=en&tm).
You can download Log Parser 2.2 at http://www.microsoft.com/downloads/details.aspx?FamilyID=890CD06B-ABF8-4C25-91B2-F8D975CF8C07&displaylang=en.