I successfully have done the SD card slot mod on my WRT54G v2.2. I am using OpenWRT and have installed the Freifunk packages (http://the-mesh.org/tiki-index.php?page=LinksysSDCard). I followed all of that exactly, besides the changing the driver part, that definitely did not work. The problem is, is that the router slows down exponentially. Does anyone know if compiling the kernel with the modules is better or not? Has anyone else experienced this before? How/can I fix this? Any info would be great, I'll answer any questions. Thanks.