If you don't want to worry about buying certificates and configuring webservers for HTTPS, check out CloudFlare. It's a bit expensive ($20/month for the first site, $5/month for additional sites) if all you care about is SSL, but they offer a lot more than just SSL:

http://www.cloudflare.com/

http://blog.cloudflare.com/easiest-ssl-ever-now-included-aut...