Nooruz (the Kyrgyz spelling) is coming up next Tuesday. I wrote a long post about it last year, based mostly on traditions in Iran. Here are some more sites related specifically to Central Asian traditions:
Uzbekistan and Uzbekistan (search for "Navruz")
Kazakhstan (search for "Nauryz")
Turkmenistan and Turkmenistan
Partial history of Nowruz in Central Asia
Attempts to recognize Nowruz on the UNESCO Intangible Heritage list
Revival of Navruz after the Soviet era
I am very much looking forward to Nooruz. We've been celebrating this holiday in the US for the last several years and it's one of our favorites. But it will be much better to celebrate it here.