http://www.stereopsis.com/flux/
Software to control the colour temperature of screens based on the time of day. Available for linux/mac/windows. Yellower light is better for the human brain at night apparently. Seems to work.
http://www.morgancomputers.co.uk/
Great deals on second hand / refurbished computer kit. All online mail order. Used to be a yellow flyer, branding persists. Some great deals.
