I just did a fresh install on a system with two IDE
drives.  I already had a FreeBSD partition on hdb,
which the installer offered to add to the lilo
boot menu.  I did this, and it put the following in the
lilo.conf:

other=/dev/hdb1
	label=freebsd4
	table=/dev/hdb
	map-drive=0x80
	   to = 0x81
	map-drive=0x81
	   to = 0x80


That doesn't work!  It just reports "boot error," then
hangs.  To boot FreeBSD, you just need:

other=/dev/hdb1
	label=freebsd4
	table=/dev/hdb

without the drive-swapping.

This is probably a more generic bug; presumably, your
installer always adds the stuff to swap 0x80 and 0x81
when adding a boot partition on a secondary drive.  The
problem is, that swapping is sometimes necessary (if I
were wanting to boot DOS, for example) and sometimes it
is both unnecessary and won't work (BSD, for example).

later,
chris