To answer to your questions:
1. When I came visit my older cousin, I watched him play to his computer on X wing, then on Tie Fighter. I was amazed (I was 7 or 8, don't really remember). My very first PC video game was Mechwarrior 2 & X Wing vs Tie Fighter. I was 12 years old or 13. And since I love all subject related to space and futuristic content. Well, it was just simple for me. Freespace is a space sim shooter, so I could only love it.

However, finding Freespace 1 and 2, in France ans specifically in Paris and his suburbs, was very challenging on day one. There wasn't enought copy in the surrounding retailers. However, I got one.

2. I found HLP because of Google. I was searching some news contents for Freespace 2. Like new campaigns, or new ships or whatever. At first, I discovered Sector Game then later HLP.
3. There's a great communty here. But I'm more interested about mods and how to enhanced the actual gameplay/visuals (fredding, and so on).

Now, I'm still talking about Freespace 2 when people search some space sim shooter with some modern visual, on several french forum. Plus, some friends and me, we've just opened a dedicated website for all kind of sci-fi video games (PC, X360, PS3 and so on).
If you can understand French, here the website I'm talking about:
http://www.spaceanomaly.com .