I was wondering if you have enabled a mobile version of the forum. Taking into account that lots of people have now a smartphone, including myself hehe.
I know there's a good app http://www.forumrunner.net/
that is free for the forum owners to install, and allows us users to access on our mobiles. I use it for another forum I'm in and it works great. Personally I have being visit the forum very little since the forums got blocked at work and when I arrive home, I usually busy with other things and so and so forth. But having access through my mobile will make it lot easier.
Well, please let me know if you decide to install the app. Oh and It's available for users who use iPhone and Android.