[achillean]

This is actually one of the earliest searches that was used on the Shodan search engine! Shodan specializes in finding all devices connected to the Internet (including Telnet, SSH, FTP, SNMP etc.):

http://www.shodanhq.com/search?q=hp+jetdirect http://www.shodanhq.com/search?q=laserjet http://www.shodanhq.com/search?q=HP-ChaiSOE