March is Irish-American Heritage month. Surprised? Over 7 million Irish immigrants have come to America since the 1600s, so you might be able to really celebrate St. Patrick's Day.
The American Foundation for Irish Heritage is a good place to start looking for your Irish roots. You can also go to Cyndi's List and then go to Ireland to get other sources for searching for your Irish ancestors. There may be a pot of gold and the end of the rainbow waiting for you!