Tonight is the peak of the annual Geminid meteor shower, one of the better ones during the year. It doesn't get as much publicity as the warmer-weather Perseids in August, or the sometimes spastically-stormy Leonids in November, but the Geminid shower is a solid, reliable one with upwards of 100 meteors per hour visible (though more like half that on average). Discover Magazine has a nice article about them, and as usual I recommend reading my meteor shower observing advice... it was written for a different shower, but the general idea is the same. Bottom line: dress warmly, lie out in an area with lots of visible sky, and the best observing is after local midnight. Have fun!