hi yeah I should ask the author about this directly.
After installing this is the disk usage
plug:/boot# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mmcblk0p2 742M 522M 182M 75% /
tmpfs 252M 0 252M 0% /lib/init/rw
udev 10M 140K 9.9M 2% /dev
tmpfs 252M 0 252M 0% /dev/shm
/dev/mmcblk0p1 125M 17M 102M 15% /boot
So for anyone who is following those instructions and using a 1GB card, I would seriously advise making the boot ~60MB in size, instead of the recommended 140MB. You could still have three kernels installed with a partition of that size.
This is the list of currently installed packages, sorted by size for anyone who is interested:
There's definitely room for some streamlining.
edit: I never realised passwd was such a monster program, 4 times the size of busybox!

plug:/boot# aptitude search -O ~installsize -F '%p %I' ~i
linux-image-2.6.30-2-kirkwood 42.6MB
perl-modules 16.2MB
perl 13.0MB
locales 12.6MB
iso-codes 11.4MB
coreutils 11.3MB
python2.5 10.5MB
libc6 9,957k
aptitude 9,703k
doc-linux-text 8,823k
dpkg 6,705k
ncurses-term 6,701k
tzdata 6,427k
mutt 6,017k
gnupg 5,292k
apt 5,272k
perl-base 4,710k
python2.5-minimal 4,481k
openssh-blacklist-extra 4,198k
openssh-blacklist 4,190k
util-linux-locales 4,022k
libx11-data 3,609k
groff-base 3,248k
bash 3,039k
man-db 2,892k
texinfo 2,626k
libmagic1 2,621k
python-apt 2,617k
passwd 2,523k
login 2,515k
tar 2,417k
wget 2,384k
openssl 2,343k
util-linux 2,195k
e2fsprogs 2,114k
openssh-client 2,007k
w3m 1,905k
libssl0.9.8 1,868k
nano 1,769k
findutils 1,745k
exim4-base 1,696k
libxml2 1,642k
libxapian15 1,585k
libc-bin 1,475k
libdns53 1,466k
udev 1,405k
libdb4.8 1,389k
debconf 1,376k
geoip-database 1,372k
libx11-6 1,360k
libdb4.7 1,348k
ibritish 1,282k
libslang2 1,278k
libpam-runtime 1,257k
make 1,233k
debian-faq 1,219k
libgnutls26 1,217k
exim4-config 1,204k
libdb4.6 1,196k
grep 1,188k
debconf-i18n 1,163k
manpages 1,130k
libdb4.5 1,118k
libstdc++6 1,094k
wamerican 1,044k
dictionaries-common 1,036k
libpam-modules 987kB
gettext-base 983kB
sed 979kB
net-tools 963kB
bash-completion 958kB
exim4-daemon-light 950kB
iproute 938kB
tasksel 926kB
adduser 901kB
libnewt0.52 889kB
cpio 872kB
pciutils 860kB
libkrb5-3 799kB
procps 791kB
libcwidget3 766kB
diffutils 762kB
ca-certificates 758kB
bsdmainutils 745kB
vim-tiny 741kB
heirloom-mailx 709kB
rsyslog 684kB
libgpgme11 672kB
python 635kB
libncursesw5 623kB
busybox 606kB
libncurses5 586kB
x11-common 582kB
m4 573kB
mlocate 569kB
dhcp3-client 565kB
libgcrypt11 557kB
nfs-common 549kB
dhcp3-common 545kB
klibc-utils 537kB
psmisc 528kB
apt-listchanges 516kB
apt-utils 500kB
ncurses-bin 496kB
libept0 479kB
base-files 467kB
lsof 455kB
libpcre3 446kB
libldap-2.4-2 434kB
initramfs-tools 430kB
libsasl2-modules 422kB
ispell 418kB
gpgv 406kB
initscripts 397kB
libisc50 393kB
doc-debian 385kB
dnsutils 377kB
python-reportbug 365kB
whois 360kB
procmail 356kB
libgeoip1 344kB
mount 336kB
libreadline5 328kB
cron 315kB
bc 311kB
libsepol1 303kB
less 299kB
gzip 295kB
bsd-mailx 291kB
sysv-rc 279kB
libk5crypto3 270kB
ucf 266kB
reportbug 262kB
patch 258kB
sysvinit-utils 254kB
libgssapi-krb5-2 250kB
libpam0g 246kB
libgc1c2 242kB
mawk 238kB
libgpg-error0 233kB
ifupdown 229kB
debianutils 221kB
libselinux1 213kB
libdevmapper1.02.1 209kB
libgssrpc4 197kB
mime-support 193kB
telnet 188kB
base-passwd 184kB
tcpd 180kB
libblkid1 176kB
bind9-host 172kB
libedit2 168kB
ftp 164kB
libxcb1 156kB
time 152kB
libevent-1.4-2 147kB
iputils-ping 143kB
libbz2-1.0 135kB
liblwres50 131kB
libxext6 127kB
libgdbm3 123kB
libnfsidmap2 119kB
libkrb5support0 115kB
installation-report 111kB
libbsd0 106kB
libcomerr2 102kB
libgssglue1 98.3kB
libisccc50 94.2kB
flash-kernel 90.1kB
hostname 86.0kB
javascript-common 77.8kB
exim4 73.7kB
libcap2 69.6kB
libattr1 65.5kB
debian-archive-keyring 61.4kB
uboot-mkimage 57.3kB
linux-image-2.6-kirkwood 32.8kB
libtext-wrapi18n-perl 28.7kB
plug:/boot#