CAcert

Cacert provides free SSL Certificates and is a non-profit organization incorporated in Australia.  You need to join their community and agree to their terms in order to get a free SSL Certificate.  My browser did not trust their certificate so if its important that your customers don't get a warning message from their browser then this may not be the certificate for you.  However, if you are looking for a free SSL certificate that will encrypt your pages then this could be perfect.

CAcert Free