https://letsencrypt.org is an awesome initiative, to enable encryption on webservers, by making certificates freely available. It is supported by Mozilla, EFF, and several others.
I joined the beta, and today I created a certificate for my server. Not only does it give you free certificates, but it also just worked flawlessly out of the box, – it just took a couple of minutes – much easier than any other certificate issuer that I have tried. I can highly recommend it, – you can sign up for the beta here (more info), or wait until it goes live in December.