Read the progress report of week 10 of the project "d-i support for GNU/kFreeBSD".
If you have some spare time, please work on Parted UFS partitioning.
The Debian IRC development channels for this should be #debian-boot and/or #debian-kbsd.
Update 20090803:
Please read my email with links to iso images to test.
Update 20090804:
GNU Parted no more segfaults (in that point, at least).
Updated current help needed.
Update 20090806:
Fixed a (big) typo (week 8 -> week 10).