Read the progress report of week 8 of the project "d-i support for GNU/kFreeBSD".
If you have some spare time, please port BusyBox "ip" and "route" on Debian GNU/kFreeBSD.
I think that the Debian IRC development channels for these should be #debian-boot and/or #debian-kbsd.
Update 20090720:
Linked the final progress report instead of a draft.
Updated the list of BusyBox applets.
Update 2 20090720:
Removed doc about building BusyBox because it is now a new post.
Update 3 20090720:
Removed doc about building debian-installer because it is now a new post.