Google Analytics

http://www.google.com/support/googleanalytics/?hl=en_US

Select View Source from your browser's menu and look for the tracking code. It should be immediately before the tag of your page, and should look exactly as it was provided to you:


You should see your own account number in place of the xxxx-x in the example above. If you need a fresh copy of your code, click the Edit link next to the appropriate profile on the Analytics Settings page, then select Check Status at the top-right of the table.
If your tracking code has been installed correctly, and you're still not seeing any data after 24 hours, read I'm not seeing any data in my reports