I can’t help it – it just makes my skin crawl to see certain errors, like “between you and I” and “this program has it’s own spellchecker.” It’s one thing for non-native speakers to make these kinds of mistakes and for the occasional typo to slip through, but writing (and speaking) well really isn’t that difficult. Though I’m not an English teacher, I’ve always had a certain knack for grammar and spelling, and I hope that my English site can help cut down on obvious mistakes.