How to check if your website is blocked in China

[Buck]

1. Just Ping - They have checkpoints inside Hong Kong and Shanghai in China.
http://www.just-ping.com/index.php
2. Watch Mouse - This service too has monitoring stations inside Hong Kong and Shanghai in China.
http://www.watchmouse.com/en/ping.php
3. Website Pulse - In addition to Hong Kong and Shanghai, Website Pulse conducts website connectivity test from a computer located in Beijing as well.
http://www.websitepulse.com/help/testtools.china-test.html
Unlike the previous two services that simply do a ping test, this service connects to your site and tries downloading the complete HTML web page. The total response time shows how long it takes for your website to download.