I guess I can't help myself. librarian.net has a great post and video recording of the magic that is Ubuntu. A intrepid librarian turns three donated computers into real everyday desktop workstations by installing Ubuntu on then in double quick time.(I wonder if there is a Guinness record for this?)
If the business takes your fancy, check out this tutorial here -- the best step by step DIY.
(And hey! the vid has a great cajun soundtrack! Oooooeee!)