Unusual free ways of accessing blocked content

Geographically restricted streaming audio and video can be accessed using VPNs, proxy servers (and anonymizers) and TOR network:
How to access BBC iPlayer, Hulu, Fancast, Pandora, any other region-restricted sites

But if you want to access content blocked in your office, school, college like Facebook, MySpace, Twitter, Hi5, Orkut, etc. you can use the following tricks:

• Yauba
  Yauba is a "privacy safe search engine". It routes all traffic through its server and changes links to its own ones.
  
• Search Engine Cache
  Search engines like Google and Yahoo cache web-pages. These cached pages are stored in search engines themselves, which likely will be added to the blocked list. When you see google search results, you may notice the "Cache" link nearby. If you click onto it, this will bring you the cached version of the page. Note that the cache might be updated less frequently than the web-page itself. Also some admins block Google cache.
  
• Online Translation Services
  Online translation services like Google Translate, BabelFish allows you to translate a website from one language to another and display the translated results on their own page. You can use them to enter blocked web-sites. You will need to re-tranlate a web-site even if you don't need it.
  
• Web2Mail
  Web2Mail is a free service that sends websites you want to read right into your e-mail box. You just send an email to www@web2mail.com with the URL in the subject and the service will send you the page by e-mail.
  You can use alternative services like WebinMail.
  
• Google Mobile Cache
  Google Mobile Search allows you yo display HTML web-pages as if you are viewing them on a mobile phone. Note that Google removes javascript and CSS, breaks a longer page into several smaller pages.
  
• RSS Feed
  Many web-sites offer RSS feeds. Subscribe to them with an RSS reader like Google Reader and you will be able to access this content from the reader.
  
• Archive.org
  Archive.org is an internet archive. It keeps a copy of many websites from the Internet. You can access not only the latest copy from the web-site, but also previous copies made earlier.
  
• Mobile device simulator
  Opera Mini simulator is Opera Mini 5 live demo, that allows to see how a web-site would look like on a handset.
  You can also try other simulators like dotMobi Online Emulator.
  
• Screen-Resolution.com
  Screen Resolution Checker is intended to be used by web-designers to check how their websites look in different resolutions. It works only in Internet Explorer, allows you to visit internal links.
  
• BrowserShots.org
  BrowserShots is similar to Screen-Resolution.com, but only shows you the snapshot of a web-page, so you can only use it to accessweb-site that do not require you to login.

Do you know any other unusual, but effective way to access blocked content?