No surprise here, I guess

What Kind of Reader Are You? Your Result: Obsessive-Compulsive Bookworm You're probably in the final stages of a Ph.D. or otherwise finding a way to make your living out of reading. You are one of the literati. Other people's grammatical mistakes make you insane.
Dedicated Reader
Book Snob
Literate Good Citizen
Non-Reader
Fad Reader
What Kind of Reader Are You? Create Your Own Quiz

Yeah, I've read a lot - - though, given my famously Low tastes, I hope it's not accurate to characterize me as a "book snob". And, again, given my own imperfect mastery of spelling, I'm not especially offended by others' grammatical mistakes. But, yeah, I guess I'd have to say that "obsessive-compulsive bookworm" is probably a fair cop.

(A shout-out to LJer "ecbatan" for the link.)