Available Information  

The IP address (or DNS name) of the connecting computer

This is not always the computer that is browsing!

The URI of the page that is being accessed

Usually includes the filename of the page being accessed

The date and time of the connection

Almost always in GMT

The "status code"

Whether or not the page was sent successfully

The number of bytes returned to the user

Can (sometimes) be used to see if the user got the whole document

The referring page

The URL of the page where the browser clicked to get here

The "User Agent" String

The and version of the browser