"Mark Pilgrim":http://diveintomark.org/archives/2004/06/02/apostrophe talks about how his writing and hearing editor's comments on his "Dive into Python":http://www.diveintopython.org book made him more sensitive for spelling and grammatical errors. As a non-native speaker I'm sure I've made many, many mistakes. In the article Mark points to the Brittish "'Apostrophe Protection Society'":http://www.apostrophe.fsnet.co.uk which thankfully lists all apostrophe (for those that don't know, this is an apostrophe: ' also known as single quote) rules. I looked at them (and learned them) and realized I never learned those rules at school. We learned lots of English words, stacks of grammar rules, but these weren't among them, for as far as I can remember anyway. It's funny to see that this Apostrophe Protection Society once again shows that your growing perfection on one side eats from the other ones. The lay-out of that site is a dreadful default-Frontpage one. I'll now probably never dare to redesign this site again. Eww.
By the way, in the Neterlands we have term for people who are obsessed with comma's (LOOK WHAT I DID!!!!), apostrophs etc. We call them "kommaneukers" which translates to "comma fuckers", just so you know what they're yelling at you when you walk through Amsterdam and laugh at the misplaced apostrophes on banners you see there. Hint: Don't do it, there's a tiny chance that they may have different rules concerning them over there. Have you noticed that most of the banners over there make no sense anyway? Weird country.
Recommended bedtime reading for candidate punctuation-obsessed people with too much time on their hands: "'Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation'":http://www.amazon.com/exec/obidos/ASIN/1592400876:
bq. A panda walked into a cafe. He ordered a sandwich, ate it, then pulled out a gun and shot the waiter. 'Why?' groaned the injured man. The panda shrugged, tossed him a badly punctuated wildlife manual and walked out. And sure enough, when the waiter consulted the book, he found an explanation. 'Panda,' ran the entry for his assailant. 'Large black and white mammal native to China. Eats, shoots and leaves.'