If you want to track the Googlebot (Googles Spider), you should sign up for free with google-dance.com.
They released a server-side program called "GoogleTrax" which will enable you to track the "Googlebot", which is the Google Spider!
The program is completely FREE and can be Downloaded HERE
http://www.darrinward.com/googletrax/ . You will need to have PERL installed on your server and have SSI (server side includes) permissions before being able to run this program. Luckily, most servers have these features installed by default! Feedback / Support is available via. telephone or email.