We would like to activate PulseAudio by default in Fedora. For that to work, the gconf option /desktop/gnome/sound/enable_esd needs to be set to "True" by default, so that gnome-session starts "esd" which is actually a compatibility script which starts PA. (Yeah, it would be cleaner to patch gnome-session to start PA directly, but this way we get sound event support for free and stuff, and all that now.) So basically, in desktop_gnome_sound.schemas.in the variabe /desktop/gnome/sound/enable_esd should be set to "true". The fix is so trivial I am too lazy to prepare a patch... If you're OK I can do this change myself, since thank god we have no more ACLs set on our packages...
Patched in Rawhide