For a more complete look at the signs of depression, see the chart below. The symptoms vary from person to person, and they may wax and wane in severity over time.
http://www.helpguide.org/mental/depression_signs_types_diagnosis_treatment.htm#signs

Everyone experiences some unhappiness, often as a result of a change, either in the form of a setback or a loss, or simply, as Freud said, "everyday misery."
http://www.reutershealth.com/wellconnected/doc08.html

Depression: Signs and symptoms - MayoClinic.com
http://www.mayoclinic.com/health/depression/DS00175/DSECTION=2

The depression test also provides an in-depth analysis of your risk factors for depression, and of your symptoms of depression.
http://www.depression.realage.com/

Types of Depression
http://depression.about.com/od/mooddisordertypes/Depression_Types.htm

Depression Treatment
http://depression.about.com/od/treatments/Treatments.htm

Treating Depression
http://www.depression.com/treating_depression.html

NIMH: Depression
http://www.nimh.nih.gov/healthinformation/depressionmenu.cfm

Treating Depression Naturally - Natural Remedies for Depression
http://www.nativeremedies.com/mindsoothe_for_depression.shtml

Depression can be scary and debilitating. It can make doing even the simplest tasks, like pouring a bowl of cereal or taking a shower, seem difficult. Fortunately, it's not impossible to deal with depression
http://www.mindbodyfocused.com/mind/dealing-with-depression.php