Dear Everyone Who Feels the Need To Remind People That the Decade Doesn't Really Start Until 2011:
Please stop. Not only are you being an intellectual snob, you are being an inaccurate intellectual snob. Yes, you are correct, there was no year "Zero". However, you are proceeding from a false assumption, namely that the celebration of a new millennium, century, decade, et cetera, celebrates the anniversary of the first year of the Common Era (or Anno Domini, if you prefer it.) In fact, the decision to mark the decade is a purely arbitrary one, which could be marked from any point (one might as well mark it from 1582, the year the Gregorian calendar was adopted,or 1752, the year it was adopted in Britain, just for example.) None of these milestones are actually important in anything other than human opinion. And since consensus opinion holds that we mark as important the years that are divisible by ten, we celebrate at those times.
Of course, since the division is purely arbitrary and unimportant, you may continue to celebrate the arrival of the new decade in 2011. Heck, you can celebrate the arrival of the new decade every year if you want to; it's always been ten years since ten years ago. But please, stop pretending that you're "more right" than everyone else when you do so. It's 2010 because the calendar's odometer rolled over to show a zero at the end. There doesn't need to be a better reason.