Now that feisty is out, can you upgrade the xine engine for totem. It is especially critical to enjoyable DVD playback with Totem that the xine engine be xine-lib 1.1.4
I experienced this audio-video synchronization problem in another distro, and upgrading the xine engine fixed the sync bugs. I also had to upgrade libgcrypt to libgcrypt 1.2.3 after upgrading the xine engine (xine-lib).
The only drawback is that the newer xine engine does not play Real media files.
I specifically request a package for upgrading xine-lib 1.1.2 to xine-lib 1.1.4 and I will probably need libgcrypt 1.2.3 as well. I guess those packages should be in a repo and available through Synaptic.