I have submitted my 2010 Hugo Award ballot. I didn't even leave it to the last day. Remember, you can't guarantee that the voting web server will be running on the last day/hour/minute when you finally get around to filling out your ballot. Vote sooner to give yourself some leeway in case of unforeseen technical difficulties. Also, if you find that you've mislaid your Hugo Voting PIN (despite multiple and much-appreciated reminders from Aussiecon 4), you need to give yourself time to recover it from A4.