You keep getting these fancier and fancier video cards with gobs (512MB now avaiable) of video memory. But how much of the time is that just sitting there?
A nice idea, but I read through the kernel-trap archives and the associated thread there and can't find any discussion outside of ancient equipment and no confirmation of it working AGP or PCI really. Did I miss something?
I came across these step by step instructions on how to do this with an nVidia AGP video card. Note you can't use the nvidia driver to run X while doing this, you need to use the nv driver that comes with X.
It also includes how to make this into swap space. Now if only I had one of those fancy 256 or 512MB cards and not my crappy little 64MB.