Here we've arrived at the last of the single digit add-ons to the twenty-first century and we still don't seem sure what we're calling this decade.
The 'two-oughts' seems awkward. Nobody says 'ought' anymore. The 'two-ohs' doesn't do it either -- sounds more like something from Roman times. More like CCIX than MMIX.
My vote's for calling this decade the twenty-ohs. And it won't be long (365 days) until we begin the twenty-tens.
But until it's time for wishing a happy new decade, I'll stick with plain old Happy New Year.