I emailed one of the app developers of "Board Express", and he said any forum can use this app as long as the forum owners decide to download the plug in.
In a nutshell, this app is basically Tapatalk" for the Windows Phone. It organizes the forum in a way where the view on a smartphone is much more convient. It makes it much easier to use forums on a smartphone. It makes it easier to read, type, navigate, and run the forum. It does not use as much resources as the desktop version so the phone can run the forum much smoother and faster.
I cannot run the desktop version of Tom's Hardware forum on my smartphone (Samsung Focus S with Windows 7.5 [Mango]).
I for one would love this app. I really want to use this forum when I do not have my computer with me.