I just installed the Macsense Aeropad Mini on my iMac G3 350 MHz and it works perfectly.
It does the wi-fi through the Ethernet, and gets its power from the USB so there's no extra power cable.
HOWEVER, note that there is a programmed in error in the setup wizard, and there's no insert in the box. Be sure to go to their help pages as noted in the enclosed directions.
Essentially, when you tell it the name of your wi-fi network, it centers it in the parameters box, instead of left justifying it, so it doesn't find it, but looks for a network that is essentially a bunch of spaces then a name, rather than just a name.
mike
Message was edited by: michaelpjr