STILL when I see the "it's" vs "its" mess that has proliferated in e-mail, newsgroups, electronic bulletin boards and elsewhere, but I'm gradually adjusting to the confusion.
What I can't bear to countenance is the "then/than" misuse in the writings of obviously otherwise well-informed appearing in FT. "Then" is an adverb; "than" is a conjunction, and ne'er the two shall meet.
I doubt a spell-checker is what's needed; I'd favor a grammar-checker if I knew of one friendly or efficient enough to consider...