Mute walk through videos aren't super-helpful, though having a "common tasks" or "hidden tricks" area in your website with auto-walk through could be helpful for complex tasks. If you could at least give some descriptive text so there is some narrative, I could see that being helpful for enterprise app support, where users are often required to move through dozens of screens to accomplish anything.
On the social side there are options, too. Allow people to share a browser tab and let others watch what they are doing (live, with chat [leverage Facebook!], would be best, but coming back to recorded sessions could be interesting, too). That could be used by companies doing remote training sessions (though FB probably isn't an option there [yet]).