It's a blower fan I made a year ago from three X1800/X1900 heatsinks. It runs on 5v or 12v powered by my fan controller, though I generally only use the 5v since 12v makes it sound louder than a hairdryer. It does blow
quite a bit of air at 12v.
http://img521.imageshack.us/img521/8...wer1rr1.th.jpg
http://img521.imageshack.us/img521/2...wer2xa3.th.jpg
I put it next to my keyboard there because it's perfectly level with my chest if I position it on its side like that. The air that comes out isn't a straight stream; it curves a bit. By having it blowing sideways, the air sweeps across my chest.