PCs/Laptop with linux preinstalled.

Linux is now not all all geeky stuff. People like working in Linux & praise it's powers & capabilities to handle specialized & general tasks. Dell, system76, and ZaReason offer excellent PCs and laptops with pre-installed Ubuntu.
These site provides a pre-compiled list of some pc/laptop vendors that provides linux
-> http://lxer.com/module/db/index.php?dbn=14 
-> http://www.linuxhq.com/vendors/systems.html

And after that you should read these links
http://www.geeksaresexy.net/2010/11/08/why-buy-linux-pre-installed/
http://www.pcworld.com/businesscenter/article/212014/how_to_buy_a_computer_preloaded_with_ubuntu.html