Just a minor nitpick on something I've noticed a few times:
As many of you know, when you downvote a question/answer, it gives you a message prompting you to leave a comment about why you did.
This is all well and good, except that I tend to write a comment first, and then down vote later if there's no improvement/response. The message still prompts you to leave a comment, even though you already have added one.
I know it's really minor, but it's just a little oddity that I noticed. It'd be nicer if it only gave the prompt when you actually hadn't commented, since the big dark red box (on meta anyway), always catches me as a "problem".