WP-log-robots is a wordpress plugin, we could used it to loged the search engine robots activity.
In case you want to make all steps manually:
Upload to your plugins folder, usually
wp-content/plugins/ and unzip the file, it will create a
wp-content directory writeable by the web server.
Activate the plugin on the plugin screen.
For more info, please visit http://www.netroby.com/ .
(For feedback/comments, please send an e-mail to: netroby[at]netroby.com ).