There have been some right problems with Pulseaudio and Flash in Hardy. Youtube videos playing with no sound… Firefox freezing and crashing… it’s been a right pain in the ass.
But it seems these issues may have been resolved. Psyke83, an Ubuntuforums.org member, posted what appears to be a definitive fix here. This howto enables you to use Pulseaudio and Flash 10. Something I’d begun to fear might never happen…
Now, I only just enacted this fix on my machine, and I have yet to give it a proper testing on a variety of video streaming sites and music formats and so on. But it does look promising – right away I’ve noticed how less buggy Firefox seems…
Anyone who’s been suffering Pulseaudio/Flash problems in Hardy: follow the instructions in psyke83’s guide, then please post here your experiences.
I HATE HATE!!! 
I have implemented his fix, and I can say that it works! I haven’t suffered any flash crashes for several days now and I have put it through the “click-on-as-many-youtube-videos-as-fast-as-you-can” test, and never once had a problem.
Awesome, I’ve had good luck with it so far, thanks 🙂
Fix for pulseaudio crash on Ubuntu
in.youtube.com/watch?v=8n9YbRNsBH8