Or you could use them for Winamp Visualization!
Stefan Slonevskiy has created a visualization plugin for everyone's favorite corporate sellout
It makes your keyboard lights act like an analyzer, adjustable sensitivity and everything!
Granted, it's a ridiculously random trinket, but I like trinkets
He has also created a C++ lib for those who want to include keyboard light tomfoolery in their apps
all this and more can be acquired at his website: http://www.slonsl.nyczone.net/index.php