The USB-powered Bright Idea Light designed by Graham Alexander Bayne will provide just enough light when needed most. Although the soft silicon and plastic light bulb doesn't get any brighter when you actually have an idea, it still looks cool...and it's USB.
I think my computer's on the old side... but when most computers go into sleep mode (e.g. when the laptop screen is closed), don't the USB ports power down as well?
If that's the case, won't the screen usually provide more illumination? And would you want to walk around with the laptop screen open?