There are a few ways to get SharePoint usage reports (out of the box MOSS 2007 features):

• Site administrators, including administrators of the SSP administration site, can view usage reporting for their site by clicking Site usage reports in the Site Administration section of the Site Settings page.
• Site collection administrators can view usage reporting by clicking Site collection usage reports in the Site Collection Administration section of the Site Settings page.
• Site collection administrators for the SSP administration site can view a usage summary by clicking Usage summary in the Site Collection Administration section of the Site Settings page.
• SSP administrators for search can view search usage reports by clicking Search usage reports in the Search section of the SSP home page.

  Reporting Usage must be configured first.

  Enable Windows SharePoint Services usage logging

  Before you can enable usage reporting in a SSP, you must first enable Windows SharePoint Services usage logging for the farm hosting the Web application containing the SSP.

  Use the following procedure to enable usage logging for the farm.

  Enable usage logging for the farm

  1. On the Central Administration home page, click Operations.
  2. On the Operations page, in the Logging and Reporting section, click Usage analysis processing.
  3. On the Usage Analysis Processing page, in the Logging Settings section, select Enable logging.
  4. Type a log file location and number of log files to create.
  5. In the Processing Settings section, select Enable usage analysis processing, and then select a time to run usage processing.
  6. Click OK.

     For information about how to perform this procedure using the Stsadm command-line tool, see Usage Analysis: Stsadm properties (Office SharePoint Server).

  Enable usage reporting

  After Windows SharePoint Services usage logging is enabled in the server farm, SSP administrators must enable the usage reporting service. SSP administrators can control the complexity of usage analysis processing, and select whether or not reporting is enabled for search queries.

  Use the following procedure to enable usage reporting.

  Enable usage reporting

  1. On the SSP home page, in the Office SharePoint Usage Reporting section, click Usage reporting.
  2. On the Configure Advanced Usage Analysis Processing page, in the Processing Settings section, click Enable advanced usage analysis processing.
  3. In the Search Query Logging section, select Enable search query logging.
  4. Click OK.

  If advanced usage analysis processing is not selected, usage reporting statistics will be minimal.

  After usage reporting is enabled, site administrators and site collection administrators can view site usage summary pages that have the following information for their sites and site collections:

• Requests and queries in the last day and the last 30 days.
• Average number of requests per day over the last 30 days.
• A chart of requests per day over the last 30 days.
• A list of the top page requests over the last 30 days.
• A list of top users over the last 30 days.
• A chart of top referring hosts over the last 30 days.
• A chart of top referring pages over the last 30 days.
• A list of top destination pages over the last 30 days.
• Top queries for the last 30 days (if search usage reporting is enabled).
• Search results top destination pages (if search usage reporting is enabled).

  Read the full article here: http://technet.microsoft.com/en-us/library/cc262541.aspx