In the search for a good sshd bfd tool I've found: pam_abl
See also: http://hexten.net/pam_abl
As ISPConfig uses pam I've thought, this would be a very nice method to control brute force attacks, for sshd but also for ftp.
Could somebody help me installing this on ISPConfig with Debian Etch? I don't want to crash my freshly set up ISPConfig Debian Etch server? :-)