depression in the workplace: don't ask, don't tell?

http://www.cnn.com/2010/HEALTH/09/20/health.depression.workplace/index.html

should people who work through mental illness speak up?  what are the benefits of doing so? the repercussions?  would you judge someone if he/she told you that mental illness was in the picture?  would you hire someone who mentioned that he/she had a condition?