Ethan Benson [1] has written a shell script [2] which gathers boot-floppy resources from a specific mirror [3]. This allows preparing a basic installation ISO file with e.g. mkisofs. Some apt-get documentation may be helpful [4].
[1] http://penguinppc.org/~eb/files/boot-new-powermac.iso, 45.4MB
[2] http://penguinppc.org/~eb/files/mk-mini-iso
[3] http://www.debian.org/misc/README.mirrors
[4] http://newbiedoc.sourceforge.net/system/apt-get-intro.html
Update:
[5] http://www.debian.org/CD/netinst
[6] http://www.phy.olemiss.edu/debian-cd/
