I watch the show, but I don't consider myself much part of the fandom. (Let's just hope none of you are Equinesexuals!)
My favourite shows have always been animated, be it anime or cartoons (yes I know that's unusual for someone at 34 but I don't care what anyone thinks about that). Anyway, I herd about this and so thought I'd check it out and I'll admit, I got absolutely hooked on MLP FIM. So I guess you could consider me a Brony. I find the show, cute and adorable and I love the humour and upbeat nature of it all. I'm actually watching the series through at the moment as it just became available on Netflix, which I'm happy about as it's hard to get hold of the DVD's here in the UK. Happy days
I have watched a few episodes of the show myself (babysitting my sister) and while the story itself in any of the episodes never interested me I always found the character comedy was pretty funny and that the way characters react and attempt to solve the episode's dilemma are quite funny in a Looney toons hyperbolic and cartoony approach is pretty funny. Even when you aren't really paying attention and you look up at your tv screen and see a pink pastel pony hide under rocks in a vain attempt to be stealthy its hard not to smile or chuckle.
I really like that show Could be considered a pegasister I suppose, but haven't joined the fandom officially. My friends tell me that I'm a Pinky-pie even though I'd rather be like Apple Jack.