We faced many problem in accessing orkut in our college. We could not found any tricks that help us to access banned websites. Don't worry i have find it out..Though you can use proxy sites, using mini web browsers and websites anonymizer for this purpose , but what is for others who don't have pen drives or the PC 's CD?DVD drive is locked. Here are the tricks. You just have to keep it in mind the two processes, its really very simple...use the second one if the first one fails.
1st Process : Search Google/ Yahoo/ Msn with catche, Like "cache:URL name" (eg.cache:www.coolcompu.blogspot.com) and use the cache link to open the blocked website.
2nd Process : You can open the banned one by its IP address. This bypasses the URL based restrictions. You have to search for online IP conversion tools from that you can get the IP address of any website and after that use this IP address to open your website....

Hope you done it... enjoy your life