The good news is that within an hour of sending an email to RadioLand about the sad fate of Safari users who try to read my RadioLand blog, someone called Lawrence was back to me. The bad news is that there doesn't seem to be anything wrong:

I'll check internally with some people that use OS X/Safari to see if they can verify the problem, but there doesn't seem to be anything out of the ordinary in the page that would cause it to lockup.

Lawrence

I guess I'll try contacting Safari too.