I've lurked here for a looooong time before joining. Whenever I did an internet search for a firearms-related question, THR would show up. I decided to stay because of the civil discussions... and because THR has a good mix of viewpoints, not just ultra-tactical mall ninja bologna, like on some other sites.
I think people are waking up to the fact that mere objects aren't inherently evil, and that the responsibility for their own safety is ultimately their own... Not just here, but in everyday life, more and more people are interested in bearing arms for self defense.
(I just realized that I joined on 9/11. NO, it had nothing to do with terrorism.... just coincidence)