Here's some background information by way of Wikipedia.
Memorial Day is a United States federal holiday that is observed on the last Monday of May (observed this year on 2007-05-28). It was formerly known as Decoration Day. This holiday commemorates U.S. men and women who have died in military service to their country. It began first to honor Union soldiers who died during the American Civil War. After World War I, it expanded to include those who died in any war or military action. One of the longest standing traditions is the running of the Indianapolis 500, which has been held in conjunction with Memorial Day since 1911.Another long standing tradition is that it opens up the traditional summer movie season.
Many people observe this holiday by visiting cemeteries and memorials. A national moment of remembrance takes place at 3 pm Washington time. Another tradition is to fly the U.S. Flag at half-staff from dawn until noon local time. Volunteers place a U.S. Flag upon each gravesite located in a National Cemetery.General John A. Logan is the person credited with pushing for a Memorial Day.
In addition to remembrance, Memorial Day is also a time for picnics, family gatherings, and sporting events. Some Americans view Memorial Day as the unofficial beginning of summer and Labor Day as the unofficial end of the season. The national Click it or ticket campaign ramps up beginning Memorial Day weekend, noting the beginning of the most dangerous season for auto accidents and other safety related incidents. The USAF "101 Critical days of summer" also begin on this day as well. Some Americans use Memorial Day to also honor any family members who have died, not just servicemen.
Flags flying at Fort Logan National Cemetery during Memorial Day 2006.Memorial Day formerly occurred on May 30, and some, such as the Veterans of Foreign Wars (VFW) and Sons of Union Veterans of the Civil War (SUVCW), advocate returning to this fixed date, although the significance of the date is tenuous. The VFW stated in a 2002 Memorial Day Address, "Changing the date merely to create three-day weekends has undermined the very meaning of the day. No doubt, this has contributed greatly to the general public's nonchalant observance of Memorial Day." Hawaii's Senator Daniel Inouye, a World War II veteran, has repeatedly introduced measures to return Memorial Day to its traditional day since 1998.
Drive safe this weekend.