ethwireck can detect if the physical layer of the Ethernet is up. Laptops which use dynamic IP address assignment via DHCP have the problem that the boot process is much longer when no wire is connected to the Ethernet card. This is because the startup scripts have to wait for the DHCP request to time out. ethwireck can be used in the init script for your network card to determine whether or not an interface should be brought up. In other words, a timeout is avoided.
png2linuxlogo takes an 80x80 color-mapped (palette-based) PNG of 223 or fewer colors and converts it to a header file suitable for inclusion in the Linux kernel as the full-color boot logo. It does not modify the 16-color or black-and-white boot logos. This allows standard image editing tools such as the GIMP or XPaint to be used to create Linux boot logos. It works with 2.2 and 2.4 kernels.