This information just came from an Irish travel source:
March 30: Strike Could Affect Dublin, Shannon & Cork Airports
March 23, 2009 by irelandyes
Industrial Action on March 30
If you are traveling to Ireland on March 30, 2009 check with your airline for more info. There is the possibility of a strike that could adversely affect Dublin, Shannon and Cork airports. For more info: http://www.airport-technology.com/news/news51807.html