Once upon a time, Daniel Chen was an Ubuntu core developer and maintained the audio stack. He's no longer a core dev, but he's still doing a ton of work on audio. I can tell you first hand that practically every waking moment that he's not at the office, he's working on trying to make PulseAudio and ALSA work better in Ubuntu. Well, since he's not a core dev anymore and he never went through the Ubuntu Membership process, you won't be seeing his blog on maintaining Ubuntu's audio stack showing up on Planet Ubuntu. But you should take a look anyway. He's got a post up right now explaining why PulseAudio really isn't to blame for all your audio problems. I suggest you check it out, especially if you're running Jaunty.