/ is full, can't installkernel

[thevirtuesofxen]

I ran installkernel and it stopped saying the filesystem is full. I can't reboot until this is done, so any help is greatly appreciated. The HD is 30 GB, and here is the output of df and ls -la /boot

Filesystem  1K-blocks    Used    Avail Capacity  Mounted on
/dev/ad0s1a    507630  497364   -30344   106%    /
devfs               1       1        0   100%    /dev
/dev/ad0s1e    507630      12   467008     0%    /tmp
/dev/ad0s1f  26033570 2620042 21330844    11%    /usr
/dev/ad0s1d   1119694  107154   922966    10%    /var

total 662
drwxr-xr-x   7 root  wheel     512 Aug 17 01:08 .
drwxr-xr-x  19 root  wheel     512 Aug 15 16:50 ..
-r--r--r--   1 root  wheel    7636 Feb 24 12:52 beastie.4th
-r--r--r--   1 root  wheel    8192 Feb 24 12:52 boot
-r--r--r--   1 root  wheel     512 Feb 24 12:52 boot0
-r--r--r--   1 root  wheel     512 Feb 24 12:52 boot0sio
-r--r--r--   1 root  wheel     512 Feb 24 12:52 boot1
-r--r--r--   1 root  wheel    7680 Feb 24 12:52 boot2
-r--r--r--   1 root  wheel    1201 Feb 24 12:52 cdboot
drwxr-xr-x   2 root  wheel     512 Aug 15 16:31 defaults
-r--r--r--   1 root  wheel    1739 Feb 24 12:53 device.hints
drwxr-xr-x   2 root  wheel     512 Feb 24 12:49 firmware
-r--r--r--   1 root  wheel    2249 Feb 24 12:52 frames.4th
drwxr-xr-x   2 root  wheel     512 Aug 17 01:08 kernel
-r-xr-xr-x   1 root  wheel  253952 Feb 24 12:52 loader
-r--r--r--   1 root  wheel    7545 Feb 24 12:52 loader.4th
-rw-r--r--   1 root  wheel       0 Aug 15 16:48 loader.conf
-r--r--r--   1 root  wheel   15219 Feb 24 12:52 loader.help
-r--r--r--   1 root  wheel     385 Feb 24 12:52 loader.rc
-r--r--r--   1 root  wheel     512 Feb 24 12:52 mbr
drwxr-xr-x   2 root  wheel     512 Feb 24 12:49 modules
-r--r--r--   1 root  wheel  256000 Feb 24 12:52 pxeboot
-r--r--r--   1 root  wheel     692 Feb 24 12:52 screen.4th
-r--r--r--   1 root  wheel   36435 Feb 24 12:52 support.4th
drwxr-xr-x   2 root  wheel     512 Feb 24 12:49 zfs

Is there anything I can clean out of there?