True BusinessID EV certificate users:
http://www.geotrust.com/resources/extended-validation-ssl/installation-instructions.html
Rapid SSL, Rapid SSL wildcard, QuickSSL and QuickSSL Premium certificate users:
http://www.rapidssl.com/ssl-certificate-support/install-ssl-certificate/index.htm
Comodo certificate users:
https://support.comodo.com/index.php?_m=knowledgebase&_a=view&parentcategoryid=88&pcid=1&nav=0,1
Verisign certificate users:
Thawte certificate users: