I like to celebrate the start of a new year whenever I can. Why wait until January 1? I celebrate new years on Rosh Hashanah (Jewish new year), and in late February (Asian new years), not to mention Samhain and, yes, January 1. Birthdays are a great time for a new year, too. In fact, ANY day is the start of a new year--it's exactly 1 year later than it was this time last year.
All this talk of new years makes me think of resolutions. Resolutions should be made for self-improvement... and we should not have to wait until Jan 1 to improve ourselves. No more procrastination! Declare it a new year and get ON with your life!