I tend to take the view that if someone can't be bothered to ask a question properly, I can't be bothered to answer it. In fact, once I've determined that errors are due to contempt for language and grammar, I don't normally even bother reading the rest, either here or anywhere else.
RE : Usernames
I have a policy of always using lowercase for usernames and passwords. I can't abide case-sensitivity in anything so this ensures it doesn't cause me a problem.