RePress. It's "just" a proxy, but trivial to install. That's the cool part, that you can install it onto any server running WordPress with a click, and that it has a configurable whitelist of the sites which it will proxy. Simple idea, but effective.
Very cool. However, I'm betting that any site running wordpress will soon be blocked for people in China.
For people who don't do wordpress, but have a hosting account that runs PHP, they can always check out KNProxy...
http://sourceforge.net/projects/knproxy/
Not quite "one click" but it's not hard to set up.
Speaking of China: According to tongodeon (http://tongodeon.livejournal.com/937622.html) the "experimental browser" on the Amazon Kindle (Keyboard 3G version) has no issue showing blocked content in China (well, aside from, say, color pictures). I wonder if the Kindle Fire has built-in circumvention techniques as well.
IIRC the the browser in the Fire effectively uses Amazon's servers as a proxy (I assume the also do some compression and scaling of images and what-not), so unless China blacklist every IP that Amazon have then the content will still get through, and I'm sure Amazon have plans for making money in China.