Don't know how up to date this is, but here's some bot blocking code from a .htaccess file, you'll have to configure YourSite.co.uk:
Code:
IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*
<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName YourSite.co.uk
#######kill some bad bots
RewriteCond %{HTTP_USER_AGENT} ^Balihoo [OR]
RewriteCond %{HTTP_USER_AGENT} ^BlackWidow Rgds