root@OpenWrt:~# ipkg list_installed
base-files-atheros-2.6 - 8-7527 - 
bridge - 1.0.6-1 - 
busybox - 1.4.2-1 - 
dnsmasq - 2.38-1 - 
dropbear - 0.49-1 - 
haserl - 0.8.0-1 - 
hotplug2 - 0.9-1 - 
iptables - 1.3.5-1 - 
kernel - 2.6.19.2-atheros-1 - 
kmod-ipt-nathelper - 2.6.19.2-atheros-1 - 
kmod-madwifi - 2.6.19.2+0.9.2.1-atheros-1 - 
kmod-ppp - 2.6.19.2-atheros-1 - 
kmod-pppoe - 2.6.19.2-atheros-1 - 
kmod-tun - 2.6.19.2-atheros-1 - 
libgcc - 4.1.2-8 - 
liblzo - 2.02-1 - 
libopenssl - 0.9.8e-1 - 
libpcap - 0.9.4-1 - 
mtd - 5 - 
ntpclient - 2003_194-2 - 
olsrd - 0.5.0-1 - 
olsrd-mod-httpinfo - 0.5.0-1 - 
openssh-sftp-server - 4.5p1-1 - 
openssl-util - 0.9.8e-1 - 
openvpn - 2.0.9-1 - 
openvpn-easy-rsa - 2.0.9-1 - 
ppp - 2.4.3-7 - 
ppp-mod-pppoe - 2.4.3-7 - 
tcpdump - 3.9.4-1 - 
uclibc - 0.9.28-8 - 
udevtrigger - 106-1 - 
webif - 0.3-3 - 
webif-lang-de - 0.3-3 - 
webif-theme-xwrt - 0.3-3 - 
wireless-tools - 28-1 - 
zlib - 1.2.3-3 - 
Done.
root@OpenWrt:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/mtdblock1            6.9M      3.8M      3.1M  55% /
none                      6.7M     24.0k      6.6M   0% /tmp
tmpfs                   512.0k         0    512.0k   0% /dev