amarok-trinity depends on libnjb5 (why?)
As does gnomad2, although it was removed from squeeze (lenny version 
works fine here on squeeze) Maybe they will remove libnjb5.

For anyone getting aggravated by many lines of sysfs error messages on 
boot it is because:
http://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=libnjb5;dist=unstable#_0_3_2 


A quick fix (as root):
sed -i 's|SYSFS|ATTR|'g /etc/udev/libnjb.rules