Been using the Auto-Save plugin by Patrick Benny for a little while now. It was pretty cool when I first installed it, but for some reason now it just times out when the auto-save kicks in for the first time. The entry still gets saved by MT, but the browser doesn't seem to get any notification of it. If the entry is saved before the first auto-save attempt kicks off, then the plugin works fine.
Just another thing I need to dig into that I think may have been related to the server upgrade. I'll get to it one of these days.