Tomorrow is a stock holiday for Good Friday and here are the holiday schedule for 2004:
1/1 New Year's Day
1/19 Martin Luther King, Jr. Day
2/16 Presidents' Day
4/9 Good Friday
5/31 Memorial Day
7/5 Independence Day (observed)
9/6 Labor Day
11/25 Thanksgiving Day
12/24 Christmas Day (observed)
This About.com page has links to individual exchange holiday schedule.