Where Is My AutoSave?!

This is the second time in three days that I've had a post erased because I hit the wrong button on my keyboard or mouse and Firefox went back in its browser history. I've got slick AJAX stuff all over my WordPress dashboard. So where's my autosave? I've found one plugin that offers that capability, but, of course, it hasn't been updated to work with 2.0. Expletive deleted! I was thisclose to hitting "Save and Continue Editing" both times this has happened, too.