You definitely don't want to kill udev, especially in Lucid. Udev has a key role: it monitors your hardware and enables you to use things as the hardware changes. For example, when you plug in a usb device or insert a dvd, gnome will pop up a dialog box asking you what you would like to do. It won't ruin your system to stop udev (I don't think!) but you definitely want it running in general. Things may also begin to not function after you kill it.
@Mark Fernandes:
You definitely don't want to kill udev, especially in Lucid. Udev has a key role: it monitors your hardware and enables you to use things as the hardware changes. For example, when you plug in a usb device or insert a dvd, gnome will pop up a dialog box asking you what you would like to do. It won't ruin your system to stop udev (I don't think!) but you definitely want it running in general. Things may also begin to not function after you kill it.