You need to use a proxy. You can even make your own proxy. For more info on how to unblock a website, read these guides:

• Easily Unblock Websites At Work Or School
  
• Proxy Server Basics
• Evading Censorship: Using a Proxy to Visit a Website
  
• How Does A Proxy Server Work When Browsing The Internet?
• The Basics of How to Use Proxy

Post any more methods for unblocking sites in the comments below…

Tags: Proxy Guides //