Re: Block IP Addresses
Check your server logs. You should be able to figure out a persons IP there.
As for blocking them, you can do this very easily by using .htaccess - assuming your host allows it. (most do)
Check out the link below for instructions on how to do it. It's super simple.
http://www.javascriptkit.com/howto/htaccess5.shtml
Of course they could use a proxy to still get to your site - but there isn't a heck of a lot you can do about that.
Hope this helps!
~ Netpotion