http://www.margi.marnet.net.mk/CA/certexport-mf.html
Converting pk12 / p12 files into pem files using openssl. `openssl pkcs12 -nocerts -in mycertificate.p12 -out ~user/.globus/userkey.pem` and `openssl pkcs12 -clcerts -nokeys -in mycertificate.p12 -out usercert.pem`
http://it.toolbox.com/blogs/securitymonkey/howto-securing-a-website-with-client-ssl-certificates-11500
A wonderful article on how to setup Client SSL authentication. Includes all the openssl commands and apache config variables.
http://www.startssl.com/
Free SSL certificates which are accepted by most modern browsers. Very cool.