Not sure about the sound issue, but I had the video issue too this morning. It's because I installed the proprietary Nvidia drivers. Simply rerun the installer and it should recompile and build the driver from scratch and install it properly.

This is not really a 9.04 to 9.10 issue though, it happens whenever you upgrade the kernel - happened to me twice with normal Jaunty updates.

I disabled pulse (not uninstalled it) last night following this guide: http://idyllictux.wordpress.com/2009/04/21/ubuntu-904-jaunty-keeping-the-beast-pulseaudio-at-bay/

So far so good - fixed up my Skype lag issues.