How to access blocked websites without a proxy? Will reward anyone that helps me get in!!?

I have a bet here at work (with the IT guys) to byp our firewall and access blocked websites. I can use any method and not get in trouble for it. All they would tell me is that we use a cisco 501 firewall and a proxy servers will not work. We are on a t1 connection and use OPEN DNS. I am more than happy to reward whoever helps me with $20 on paypal