Part of creating an ergonomically sound workspace is paying attention to lighting. Poor lighting can cause eye strain (yes, your mom was right) and aside from that, it's nice to be able to see what you're working on. You can get lights anywhere, but I came across a site that specializes in lighting for your computer. It's called the Eclipse Computer Light and "will not produce any glare on the computer screen while properly lighting the work environment." That's what they say, anyway.