After running asterisknow on my test server it seems like the finished product will be somthing to write home about! One major thing that seems to be missing is some sort of time conditions for voice menus (aka night and day mode) it is also possible i am just missing it.
It would also be nice to see a forum dedicated to the appliance, like trixbox.
I have not tried anything like this yet but from browsing the gui files it looks like it will be simple to make my own plugins. Maybe even have an asterisknow forge in the future!