It's stupid. Very stupid. All it does it mess up my schedule and sleeping habits.
The main purpose of Daylight Saving Time (called "Summer Time" many places in the world) is to make better use of daylight. We change our clocks during the summer months to move an hour of daylight from the morning to the evening.
(Source: Daylight Savings Time on WebExhibits)
Fine. Why don't we just set our clocks ahead one hour permanently and be done with it? Let's "make better use of daylight" all year.