Linux.com: sshguard: Protection for OpenSSH

"Are you concerned about brute force dictionary attacks on SSH? Given the popularity of these attacks, you should be. sshguard is a new tool to help protect against such attacks. Although it is still in beta stage, it appears to work well.

"OpenSSH provides a secure alternative to clear-text logins used by first-generation network protocols like Telnet and FTP. But it's not enough simply to use SSH instead of Telnet--you have to use it wisely. If you use weak passwords with SSH, a brute force dictionary attack will reveal your secrets as easily as if your password were sent in clear text.

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• Linux Journal: Single Packet Authorization(Mar 06, 2007)
• informIT: Mitigating the Security Risks of SSH(Aug 27, 2006)
• Linux.com: Accelerating OpenSSH connections with ControlMaster(Jun 07, 2006)
• Geek Pit: Five-Minutes to a More Secure SSH(Apr 24, 2006)