It's a Crane Fly (genus Tipulidae).
The cool thing about Crane Flies (and all Dipteras) are their counterweights...their halteres. Those little knobby things sticking out of the fly's thorax are the functional equivalent of gyroscopes. They counterbalance the movement of the fly's wings and help it maintain the proper attitude in flight, as well as providing feedback directly to the fly's wing musculature, a sort of autopilot.
Pretty cool, huh?
These are harmless. No sting, bite, or any other annoyance. They're not male mosquitos (I hear that one a lot).