With Ubuntu, you have the option of performing an OEM installation – clearly aimed at distribution of computers and business users.
Newsforge have written a small piece about it and got some comments about it's usefullness.
The task of creating Ubuntu 5.10's OEM mode installer fell to Colin Watson, lead programmer of the Ubuntu installer team. He decided early on in the discussion that the best option was to expand the functionality of the existing desktop installer code instead of writing something from scratch, thus providing not only an OEM solution, but a flexible installer that can handle additional install modes in the future.
Watson says that bug reports have started to come in from OEMs, though as yet none have notified Ubuntu of a real-world deployment. However, with new markets opening up in countries like China and the advent of extremely low-cost PCs and portables for the Third World, the OEM Linux market may be just beginning.