This version is stable, i've looked in www.openssh.org too. "OpenSSH 3.5 released October 14, 2002. Contains support for SSH1 and SSH2 protocols." (www.openssh.org)
Take a look in the site www.underlinux.com.br in the section "Versões Estáveis" -> Stable Versions, in english. The OpenSSH 3.5p1 is in the list. There is the list: Versões Estáveis Kernel 2.4.20 Kernel 2.2.23 WuFTPd 2.6.2 ProFTPD 1.2.7 Sendmail 8.12.7 bind 9.2.2rc1 Squid 2.5.STABLE1 Apache 1.3.27 MySQL 3.23.54a -> I use the mysql 3.23.55 OpenSSH 3.5p1 -> There is the OpenSSH 3.5p1 PHP 4.3.0 Samba 2.2.7a qmail 1.0.3