I have been without a working sound subsystem for a couple of days now. Turns out that the device nodes never get their acls properly:

$ ls -l /dev/snd/*
crw-rw---- 1 root root 116, 7 2008-09-14 22:29 /dev/snd/controlC0
crw-rw---- 1 root root 116, 6 2008-09-14 22:29 /dev/snd/pcmC0D0c
crw-rw---- 1 root root 116, 5 2008-09-14 22:29 /dev/snd/pcmC0D0p
crw-rw---- 1 root root 116, 4 2008-09-14 22:29 /dev/snd/pcmC0D1p
crw-rw---- 1 root root 116, 3 2008-09-14 22:29 /dev/snd/seq
crw-rw---- 1 root root 116, 2 2008-09-14 22:29 /dev/snd/timer

It works fine if I boot a Fedora kernel instead of the one I built myself though.

(I'm putting this on gdm as neither ConsoleKit nor udev have recently been updated, and my kernel is older than the last mkinitrd update)