Using RescoRadio and/or WMP, whenever I would "turn off the screen" (but keeps the device "on" to stream or play mp3s) the keyboard lights STAYED ON, which was really dumb.
Here are the reg keys to fix this as well as control all the KB lights behavior. Mabye this will be turned into an app by some nice programmer.
HKLM\System\CurrentControlSet\Control\Power\State
You'll see tons of folders, like BacklightOff, ColdReboot, On, etc.
In each folder, you'll find this:
kyl0 with a value of 4 or 0
4 = off
0 = on
This key
\ScreenOff\kyl0 controls the KB lights behavior when the screen is turned off. Change it to 4 and soft-reset.