It seems that there would be some way to turn these backlights off or at least toggle the brightness in the settings menu. They are blindingly bright in a dark room.
Luckily for us, the LEDs Hack app will allow you to turn these off. This app can be found in the market.
Note: Your phone MUST be rooted.
UPDATE: Unfortunately, every time your phone reboots, these boxes will all be unchecked, so you’ll have to do it again to turn them back off. Hopefully there will be a native way to change these settings in the future.