If you're trying to access a Wikipedia article today and are unable, you have a few options:
For pretty much everyone, you can use a bookmarklet:
javascript:$('body>*').show(),$('[id$=ay]').hide()
For Chrome users, you can install this userscript:
http://www.theobamastore.com/unblackoutwikipedia.user.js
For firefox users, if you already have greasemonkey, you can use the same userscript as above. If you don't have greasemonkey, but still use firefox, you can get a firefox extension from here:
http://theobamastore.com/unblackoutwikipedia.xpi
For pretty much everyone, you can use a bookmarklet: javascript:$('body>*').show(),$('[id$=ay]').hide()
For Chrome users, you can install this userscript: http://www.theobamastore.com/unblackoutwikipedia.user.js
For firefox users, if you already have greasemonkey, you can use the same userscript as above. If you don't have greasemonkey, but still use firefox, you can get a firefox extension from here: http://theobamastore.com/unblackoutwikipedia.xpi