i've read everything that's been translated now (it's still running). the manga's a decent bit past where the anime ended now.
i like this series a lot. just a good solid story about being an autistic little weirdo with your friends. and unlike a lot of stuff like this, it's not in this weird sort of static space, the characters are actually growing up (Koguma and Shii are planning to go to university, Reiko... hasn't decided yet, i think), which is nice.
i hope the manga keeps going for a good long while. from what i've seen of the original light novel, either the translations or the writing itself are pretty rough, lol.
