I installed Tor, as tellyworth recommended upthread. It seems to access all pages without trouble.
(Unfortunately, I’m afraid I’ve not configured it properly. It brought Firefox 10.0.2 along with it, whereas I normally run Firefox 3.6.28. Then, for example, it complains it needs Flash for a site where Firefox 3.6.28 is OK; when I attempt to download Flash the download stalls. I’m guessing that having two versions of Firefox on the same machine causes confusion. I’d hope an experienced expert could recommend a workaround that doesn’t require massive de-install or such.)
(And, unrelated to censoring(?), CAT sometimes provides slow or very slow connection, adding to the confusion and irritation.)