Al --
This functionality is built into Microsoft Project 2007, but not any prior
versions. This feature works great for holidays that fall on a specific day
of the week, such as Thanksgiving, which falls on the fourth Thursday of
November every year. It doesn't work so great for holidays that fall on a
specific date, such as Christmas Day, which occurs on December 25 every
year. When Christmas Day falls on a Saturday or Sunday, you still need to
create a holiday manually on either the Friday before or Monday after,
according to your company's way of designating the holiday. Hope this
helps.