With a potential of 1.3 billion people not having access to your website, you could be missing out on decent some traffic if your website is blocked in China.
Ok, not everyone in China has web access but they will surpass the US in the number of people online in the not too distant future. There is a website: Greatfirewallofchina.org (blocked in China) which is suppose to test if your website is blocked or not.
I don’t know how well it works, but it looks like my Tokyo website is not resolving here for me. I have no idea why, or how I might be able to fix this.
If you would like me to test your site, just drop your URL in the comments.