SPCR

Now I'm not sure if/how you could use this with a computer. But they will sit on the desk while you work with a PC. I bought mine at Walmart fot $14.....it is a smaller version of the one in the link. It works off AC with a small wall-wart which also charges the built-in ni-cad batteries. It also has a compartment for four "D" cells. This is a 6v system. The smart part....it automatically selects the least costly power method. AC first if available, then the re-chargables, finally the std D cells. What I really like about this small version.....you have a dial to select fan speeds. At the minimum, this fan is quiet. The larger 12V fan in the link, is only 2-speed. I've also seen them at Target stores. Believe it or not.....they come charged up (without the d cell batteries however).

Link

Neat. How much air does it move? I have this fan that is from some store online, and it has a moving grate on the front, so that the air oscillates without actually having an oscillating fan. It is 120AC though.

I do have a version of the 12V fan in the link (no batteries) It blows a bunch of air, even at the low speed.....but it's noisy.

The little one I have has a fan about 120mm. It's quiet enough at the lowest setting. Turned to the highest setting, it blows more air than any 120mm computer fan I have. But it's too noisy at that setting. On the batteries, it turns slower and quieter.....

On batteries it must be getting less voltage, you could also feed it less voltage in the power port if you really wanted to. The fan I have is pretty noisy, but it works really well, so I'm happy with it.