Thanks to everyone who's given me advice and suggestions regarding Tunnels & Trolls. I've already been given a copy of the 7th edition rules to examine by a friend and have ordered a copy of the 5.5 rules from Flying Buffalo, as well as several solo scenarios. I'd like to try and get as full an experience of the game as possible, so I can dispel any misapprehensions I have about it. I suspect that, while it probably won't be quite up my alley, I will learn a great deal from giving the game a second look after all these years.
Everything I've seen suggests the T&T community is every bit as vibrant -- and old school -- as the OD&D community. There's a lot we have in common, not least of which being our reverence for the Old Ways in the face of brandification. Indeed, T&T holds a lot of fascination for me right now, because, by not being a huge mass market success, it was better able to hold on to its original spirit and approach than was D&D. In many ways, T&T represents a path not taken for D&D, at least in how it's been published and supported over the last 30+ years. I can't help but be a little jealous that D&D didn't enjoy a similar fate.
In any case, I'll be posting my thoughts and experiences with Tunnels & Trolls in the weeks and months ahead. D&D will probably always be "my" game, but I now have the feeling I'll appreciate T&T's unique virtues far better than I ever could have as a younger person. Thanks to everyone who set me on this path.