Finished Index season 1. Going to start Railgun now (I know a lot of it is filler, but dammit, it has Misaka in it!). Definitely buying Index's dub when it hits shelves in a couple of months (and, Funi, you'd better release a Railgun dub, too!).
I'll watch Index S2 later (more Accelerator!), and apparently they're coming out with a movie and a second Railgun season in Japan pretty soon. Things are looking good for the anime, I'd say.
I glanced briefly at the light novel versions of some of the scenes I'd seen. I think I'll read those when I have time. They do a much better job of explaining the background details (I didn't really see the implications of Aleister's shenanigans in the last couple of episodes, or the "Sisters" network, until I read the novel version).