This might seem like a strange thing to mention on this blog, but here is a good web site about personal development.

http://www.stevepavlina.com

Server information.

netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | uniq -c | sort -n

Reports I.P. information about who is on your server.

Then check against a known list of SE bots at http://iplists.com