Tip of the day: To change the boot-up splash screen on Ubuntu (ex., the Ubuntu, kubuntu, xubuntu, etc. logos that are displayed before gdm/kdm fire up), `sudo apt-get install startupmanager`, then launch it from “System -> Administration > StartUp Manager”. Select the “appearance” tab, and choose the desired splash screen.
The StartUp Manager application also lets you tweak grub settings, in case you don’t care to edit the files manually.