It seems the filter I implemented, is still causing access problems, this time for those using Free Download Manager (I'll refrain from re-publishing my disdain for this program here - see the forums for the story).
I am working on resolving this, and have actually removed the filter match that was supposed to be causing it (basing it on the log files anyway). However, in the meantime, those using FDM that are unable to access either the forums or the website, can download the hphosts file from the alternate mirrors below;
Windows (ZIP) (also suitable for Linux)
http://downloads.securitycadets.com/hosts.zip (Courtesy Security Cadets)
http://downloads.securitycadets.com/hpHosts-Setup-Win32.exe (Courtesy Security Cadets)
If you would like to provide an additional mirror, please get in touch