It may be obvious, but the Internet has certainly been a large factor in the current success (or continued existence) of the wargaming hobby. (It's been a big part in the resurgence of board-gaming as well, but that's not the point of this post.)
We are in a "Golden Age" of war-gaming. The Grognards among us look back at the late 70's when SPI was an active company as an important time in the hobby, but I suspect more war-games are being published today by more companies than we could have imagined back in the 70's.
But what prompted this post is how easy it is now to find games on new topics. I recently developed a curiosity about the Balkan Wars (1912-1913). I jumped on Consim World and asked for a book recommendation and if any games had been published on the topic. Within minutes I had a the name of what looks like a good book on the topic (downloaded into Kindle within 15 minutes of making my request) and learned that S&T (of course!) had published a game on the Balkan Wars in issue #164. I jumped over to Noble Knght games, found a un-punched copy of the game with the magazine available. I ordered the game and three days later I had it in my hands. I hope to give the game a try this weekend.
I take this sort of thing for granted now days, but when I sit back and think about it, this is really amazing. Within minutes of asking the question, I had a book in my hands (so to speak) and a game (published 12 years ago) on the topic being shipped to me. This is largely due to the Internet of course. The degree of inter-connectedness that it offers is truly amazing. Gamers from all walks of life, located across the globe can come together in a close knit community to share this hobby.
If this isn't the "Golden" age of war-gaming, I don't know what is.
What would the war-gaming hobby look like today, if the Internet (or equivalent) did not exist?