Now I guess it is my turn to be a crank. I will not claim to have never made a spelling or grammatical error on this site, especially since I am an atrocious typist, but a spell checker is a crutch in the worst possible way.
If good spelling and refined grammar are important to your self-image, or if you think that bad spelling and poor grammar reflects badly upon your postings here, you owe it to yourself to NOT use a spell checker.
My spell checker sits beside my Mac. It is "The Random House Dictionary Of The English Language Second Edition Unabridged" If I think I am misspelling something, or run across a word I haven't seen before, I look it up. That is the only way that I can ensure that I learn from my mistakes or my ignorance.
Spell checkers have degraded the literacy of this nation. Common spell checkers cannot and do not catch contextual errors such as having only the word "the" in place when you meant to have "their." Common spell checkers do not prevent one from misusing homonyms (words that sound alike such as "whole" and "hole"). Nor will a spell checker likely include any but the most basic of knife, sword, or steelmaking terms as most spell checkers have only a limited vocabulary of about 35,000 words. That sounds like a lot until you see an unabridged dictionary. Forget about using foreign terms too.
Also, there aren't any spell checkers tied to internet sites that check one's grammatical errors to my knowledge. Since grammar is often a matter of style and sentence construction as it is of technical accuracy, an inflexible grammar checker is either rudimentary and suggests using the correct "On the whole, everything on that knife turned out well." as opposed to incorrect "On the whole, everything on that knife turned out good." or a grammar checker is overly picky about style and would result in everyone sounding the same, which is as undesireable as some of the more colorful errors are now.
To get into shape physically you have to do a lot of hard work. Good grammar, spelling and punctuation is no less of a committment to your mind.
Just say "no" to the crutch and open those dictionaries or usage manuals. A permanent fix is more rewarding and useful both at and away from the computer than is momentary electronic damage control on your posts.
------------------
Real artists ship--Steve Jobs