More Pi's arrived. One of them will be used to replace my current home router, which is an old laptop running Ubuntu. (See this blog for details)
The OS to be installed is Raspbian “wheezy”, but Raspbian is too heavy for me thus by running the following command, GUI stuff or large packages could be easily found. After removing the unnecessary packages, the disk space occupied is reduced to 1.1 GB, which makes it fit very well in a 2 GB SD card.
List the packages by installed size:
$ dpkg-query -W -f='${Installed-Size} ${Package}\n' | sort -n
For more entertainment the case is hand-made using cardboard, check the Punnet project for details.