Running what processor? PPC? Those things would melt.
There are all sorts of PPC chips from Freescale (macs) which run efficiently and cool. They don't have to use the IBM server version of the chip
I think AmigaOS on a netbook is a fantastic idea and could totally reinvent the OS - as long as they price it like a netbook.
Nobody is going to buy a $1000 netbook...
It might be nice to have a fast-booting, efficient OS on a netbook that works well with the smaller screen resolutions.
_nate