blackfoot, my bf flunked out of college due to drugs and alcohol, but his spelling and grammar are excellent. His mom taught school for 30 years (before she and her then-boyfriend bought the bar).
Good spelling is a sign of attention to detail-- doesn't have a lot to do with formal education or even i.q. It's a sign of caring about the correctness and precision of small things even when the consequences of messing up are trivial and most people either won't notice or won't even know that you messed up.
For instance, saying "your" all the time when you mean "you're" is just plain laziness and carelessness. The kind of person who does that and doesn't care I would expect to expose a butt crack, not brush his teeth, and fail to notice the red wine stain down the front of his white nylon turtleneck. That kind of person probably cheats at solitaire. The pictures in his house hang crooked on the wall. He walks on the cuffs of his jeans til they're frayed.
Can you picture James Bond writing "your" when he means "you're"? He would never be that careless.
