It seems that YouTube has just had a server collapse:
http://www.isitdownrightnow.com/youtube.com.html reports it as down as well.
500 Internal Server Error
Sorry, something went wrong.
A team of highly trained monkeys has been dispatched to deal with this situation.
If you see them, show them this information:
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http://www.isitdownrightnow.com/youtube.com.html reports it as down as well.