I still post over in "The Squeaky Wheel" forum here on Stangnet pretty often, but that's about it. Just not much traffic in the II forum here anymore. I still post over on MustangII.net though.
I think the II forums on the larger Mustang sites have all died off for the same reason. Eventually the moderator that is passionate about the cars and leads that particular forum steps down, and the place becomes a ghost town soon after. It happened at Allfordmustangs.com when I stepped down over there, and it seems to have happened here too.
But I'm very active with my current II (well, one of my current IIs, the other is for sale, stalled-out project), I drive it at least once a week, I take it to the meetings and on the tours of the local antique car club I've joined, and I'm slowly but surely making this former drag car more street friendly and just enjoying the hell out of it. I've found a great club that doesn't shun oddball cars, but embraces them (we've got Edsels, AMCs, my II, a VW Karmman-Ghia, and a few others, as well as your typical Mustangs, Fairlanes, etc.).
Here's a pic of my '75 II next to our club treasurer's '65. He's the one storing my '76 for me that I'm trying to sell.