Works, not foolproof Rated 3 out of 5 stars

It works about 50% of the time for me, so 3 stars.

Unlike most other proxies It requires no set-up.
It can bypass country-based restrictions (e.g., Lady Gaga's channel in Germany) and certain IP-based copyrighting restrictions.

Things I would like to remind people of what it can't do:

Can't bypass big evil companies' (Sony, UMG) copyright restrictions if they are set worldwide
Can't bypass content-based restrictions ("I'm Sexy and I Know It" by LMFAO, etc.)
Can't access private/deleted videos
No add-on is perfect.

And way to stick it to the man ;)