While I've
previously mentioned on here the benefits of using
Witopia VPN or any other paid service as a proxy server, there is a free workaround that is available to anyone:
Use
Google Translate as a proxy server. To do this, simply set the input block as any other language (e.g. Japanese), and then set the translation block as English. Then, type in the website name into the input block (
http://www.rimfirecentral.com/forums/" onclick="window.open(this.href);return false;), and it will show up as a hyperlink in the 'English' block.
Click that hyperlink and it will take you to the site, but instead of being the actual site, it's a 'translated to English' version of the site that shows up in the Google Translate application. Of course, since the site is already in English, the translation is just about foolproof

.
This way, you've not actually visited the site. Rather, Google's servers have visited it, and are then sending you (via their own domain) a perfectly translated version of the site. This helps bypass many (if not all) of the filtering tools employed.
Of course, Witopia or any other personal VPN sites would work better, but this is a good, inexpensive (free) workaround for the occasional user who may find themselves behind a wall of sorts for a short duration.