Yes, not long ago i shared my impressions from setting fail2ban up on servers in the company i work (link). And today i found this guide for preventing bruteforce attacks on sshd using Debian Etch & fail2ban.
P.S. In our company i also implemented vsftpd bruteforce attacks blocking with fail2ban. it took me to edit one line in a config file and redistribute this config to all servers using puppet 
two really great pieces of software.
This is definitely worth reading, not only by system administrators, but by everyone who works in a modern company and especially in IT department. For system administrators - it’s a really good beginner’s guide. IMHO even more important, then for example rebuilding the kernel. Why? Because you can read a lot of technical docs there on the internet, you could find answers to your “how?” questions, but no to “what should i do and what is right and what is wrong?” - it’s IMHO only a matter of experience. So, here’s the link.
