I tried a Website Test behind the Great Firewall of China and in Beijing and Shanghai http://jtbworld.blogspot.com/ was not accessible (My website was accessible though). Hong Kong had no problem to see the blog though.
On topic, I have also heard of companies that blocked blogs hosted on Google's blogspot.com and blogs in general.
Should I move the blog and host it myself on jtbworld.com? What is your experience hosting your own blog?
UPDATE: After this post was done the blog is now hosted on jtbworld.com and can currently be visited from China.