It's Persian new year(after the Zarathustrian calendar it's the 2569th year ). As far as the exile Iranians told me, it's like Chanuka, only with more presents ands fireworks.
Oh and look who gratulates for Nowruz:
http://www.youtube.com/watch?v=b_Qf_Ut5RYU&feature=player_embedded

Eh?

Here for more info:
[url=http://www.cais-soas.com/news/index.php?option=com_content&view=article&id=118:iranian-peoples-and-the-persianate-societies-celebrate-ancient-iranian-celebration-of-norouz&catid=41]http://www.cais-soas.com/news/index.php?option=com_content&view=article&id=118:iranian-peoples-and-the-persianate-societies-celebrate-ancient-iranian-celebration-of-norouz&catid=41[/url]