I'm not so much an Edgar Rice Burroughs fan as I am a Tarzan fan. I gave Princess of Mars a couple of shots, but it never captured my imagination like the idea of a savage wildman with the breeding and manners of an English Lord. Tarzan's like the ultimate superhero with his amazing abilities and dual lifestyles, but he's tough enough that he doesn't need a costume or a secret identity. He can defend his loved ones just fine without having to hide them behind a disguise. Plus, he's always running into hot jungle babes and some lost civilization or other and I'm a total sucker for both of those things.
Which reminds me that I need to try At the Earth's Core one of these days. I also dig dinosaurs.
At any rate, Scifan's Edgar Rice Burroughs page has a great, chronological bibliography of his stuff, plus links to other ERB sites, so it's a valuable resource for anyone into Burroughs' stuff, or even just part of it.