I was able to access the site using a proxy website here in Shanghai (
proxy4china.com - Free proxy site in China)
The current blocking is probably an IP address issue, your site sharing the same IP with another site that may be politically incorrect or unfriendly by Beijing standards. We have dealt previously with similar issues for international clients and here are a couple of solutions:
-Have your host change your site IP (by moving to another server?) this usually does the trick. (done that couple of times with sites hosted with godaddy)
-Get a new host
-Create a mirror site
-Find a cheap host in China (not that I want to advertise but you might check our web dept site
www.sinohosting.net )
Of course you have the option to get a dedicated IP but in most time it is not worth the money.
Hope it helps.
Pat