CloudFlare

CloudFlare is a FREE reverse proxy, firewall, and global content delivery network and can be implemented without installing any server software or hardware.

On average, CloudFlare-powered websites load 30% faster, use 60% less bandwidth, and process 65% fewer requests. CloudFlare-powered websites are protected from many forms of malicious activity including: comment spam, email harvesting, SQL injection, cross-site scripting, and DDoS (denial of service) attacks.