So, been a while, but here's something I just threw together. It's still a little rough around the edges, but it seems to be more robust than tpb for my system, at least, and it doesn't require me to make /dev/nvram available.
It uses /sys/class/backlight/thinkpad_screen/actual_brightness (from the thinkpad_acpi module in the 2.6.22 kernel) to figure out the screen brightness, and /proc/acpi/ibm/volume to figure out the volume and mute states, also provided by the thinkpad_acpi module (I'll switch to using sysfs for this when it becomes available).
It also requires the ruby-xosd package, which you can get from my overlay: svn://svn.pioto.org/pioto-overlay
For lazy paludis users, just add this to /etc/paludis/repositories/pioto-overlay.conf:
format = ebuild
location = /var/paludis/repositories/pioto-overlay
sync = svn://svn.pioto.org/pioto-overlay
master_repository = gentoo
names_cache = /var/cache/paludis/names
write_cache = /var/cache/paludis/metadata
You can get the current version of this script from subversion at: http://svn.pioto.org/rbtpb/trunk/
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