Check out http://www.pennywize.com for software that will protect your
website from password theives :)
Tested and Build on FreeBSD 2.2.2 with Apache
I have just found a site that i thought might be useful to all
webmasters out there:
It's a piece of software which will monitor and report on account usage
and multiple logins under one account. It reports instant and historial
statistics via a web page and will also email you if an account has
exceeded a pre-determined number of logins.
Our site uses it and our bandwidth usage has nearly halved! We had
heaps of fraudulent accounts and now we can stop them within minutes of
them being created. No longer do we have to search the password.org
sites to see if we have any bad accounts!
Works under any UNIX webserver I understand.