Powertop works like top for power consumption, with details about which application using the most amount of power, or in case of a laptop it’s battery power. By closing those application you can immediately prolong battery life. It’s also tells you the estimated time left for battery power on your laptop.
Powertop website: http://www.lesswatts.org/projects/powertop/

Today I bumped into this very interesting bit of history about a very little known error message generated on Unix system in response to printer related error message.
From Wikipedia: (http://en.wikipedia.org/wiki/Lp0_on_fire)

lp0 on fire (aka Printer on Fire) is a semi-obsolete error message still generated on some Unix/Linux operating systems in response to certain types of printer [...]

In the last couple of weeks there has been some beta release of popular opensource application including the upcoming ubuntu and Mythbuntu releases.
Ubuntu 8.04 Beta, which is scheduled to release on April 2008 has given us a beta version to play with. You can download it and get more information about it in ubuntu wiki: [...]

fdupes is a linux utility that uses md5sums to find duplicate files within a set of directories, using byte by byte comparison. Some of it’s options includes following sysmlinks and hardlinks, using recursive directory search, show file size in bytes and prompt user for file deletion.
We can start up fdupes with this simple command fdupes [...]