Image Credit: IYA2009 / IAU / UNESCO
If you haven't yet, please get involved. There are many ways to do this; my old post talks about many, and the US's International Year of Astronomy website has numerous ideas. Whether you are a professional or amateur astronomer, a teacher, or just an average person interested in space, there are many ways for you to contribute!
Speaking of contributions, monetary donations (tax-deductible!) are also accepted. This money will go to pay for numerous exciting activities and programs, such as the Galileoscope, a small, inexpensive telescope that schoolchildren across the world can build and use, at a price of only about $10 each. So, if you don't know what to give the space-enthusiast who has everything for a holiday gift, why not contribute money in their name to the International Year of Astronomy?