Obviously, a lot of people do this kind of thing in China, and from what we know, circumventing the "Great Firewall" isn't routinely getting people killed. But people should know what they're doing before they try it in Kazakhstan.
Porn? Perhaps the world's smut peddlers will become beacons of freedom and civil disobedience? (Sounds like a Neal Stephenson book.)
The worst thing — they just ban sites without any explanation. Site just stopped to work and you don't know why. Even w3.org was banned for some time (probably because its validator could be used as web proxy).
This is the biggest problem when governments go this route.