Spelling Errors: Stupid? Lazy? Or A-OK?

[Motorboat Cruiser]

I've come to expect bad spelling, bad punctuation and bad grammar on message boards, and am guilty of it myself from time to time. When I see it in newspapers, books and business emails though, it bugs me to no end.

And typos aren't really the problem. It's two sentences running together without a period to separate them. It's seeing "affect" used when the person meant "effect." It's seeing the word "literacy" spelled incorrectly. These are the things that drive me crazy.