Is it good or bad to have a little fan pointed directly at my xbox?

If you are having trouble with your xbox 360 overheating then the best thing to do is move it somewhere where the fans on the back are free from any obstacle in their path. As far as the fan goes i would not put it in the back of the xbox as those fans push the heat out and if you put the fan back there it will just push the heat back towards the back of the xbox. I would put the fan at an angle to help push the hot air out