Sound syncing?

I've never actually done this, but here's what I would do if I wanted lipsync.

First I'd create these basic mouth shapes. Then I would figure out which mouth shapes need to be used at what times of the given voice clip. You might find it helpful to do this in something like Flash which lets you hear sounds as you scrub through the timeline. Once you've got the timing down, encode it into an XML document. Then you need to make general-purpose events that decode the XML and use it to determine which mouth shape should be shown at a given time of the audio clip. There are XML objects for MMF, I just did a google search and turned this one up.

If you wanted to streamline the process further, you could even make your own lipsync editor in MMF. Then you could have it automatically save into XML or even your own custom format.