Can you make the images available by FTP as well, or tweak the http to make downloading more wget-friendly? Currently I'm using |wget -r -c --follow-ftp \ http://xia01.kachinatech.com/~buildd/sparc-2.2.14-potato-boot/2000-01-06/
But I find I have to manually get each directory under that because it only downloads the index.html file. Or perhaps I'm using the wrong options to wget (but those look right, according to the manual), and if so, what options should I be using?