If you want to try out a new Linux distro, be it the latest Ubuntu 11.04 Natty Narwhal daily ISO or any other (I've only tested it with Ubuntu though!) and don't want to burn a CD each time you want to try a new daily build (and you don't have an USB memory stick around), you can use a cool GRUB 2 feature that lets you boot a live CD ISO directly from your hard disk.

dmesg ("diagnostic message") is a command on Unix-like operating systems that prints the message buffer of the kernel. This buffer contains a lot of important messages from those output during boot, this can be used for diagnostic purpose.

As they announced the revamp of boot and login experiences in Ubuntu and received a great response from the Artwork Team, with many interesting concepts being submitted..

Unfortunately, maintaining a multi-boot configuration like this can be a pain, especially if you later install an operating system which overwrites the GRUB boot loader you had in place (such as a version of Windows). If your boot loader is overwritten, you could be left with no choice but to boot the most recently installed OS.

This Linux is so darned small, I can't believe the name ;)

Live CDs let you boot an operating system without installing any software on a hard drive. The Ubuntu Customization Kit, tastefully called UCK, lets you add your favorite applications into the distro.