I found this on americanbaby.com, thought it might be useful for others...

1.Set realistic goals for what you can accomplish at work. Prioritize your tasks to focus on the important ones. If you have subordinates, delegate responsibilities to them as much as possible.

2. Burn off tension through exercise. Schedule some time in the morning, during lunch, or in the evening for a brisk walk, jogging, aerobics, or weight lifting, when you can escape the pressures at work. Try yoga and deep-breathing exercises, which can reduce stress, at the office.

There are couple more you can find at http://www.lhj.com/lhj/story.jhtml?storyid=/templatedata/lhj/story/data/LHJ092004WorkStressTips_08042004.xml