Google has a web proxy that may be able to get you around your corporate firewall, and may allow you to surf anonymously.
Long story short:
surf the web from http://www.google.com/xhtml to get a proxied & simplified version of any page you want to visit. May bypass corporate firewalls, may not. May provide some level of anonymity, may not. Breaks up long pages into smaller ones, and you can turn off images.
Short Story Long