How can I get Safari to reopen my last closed tab? I'm switching back to Safari from Chrome. Now that I figured out how to get Safari to let me navigate tabs the way I want, only one thing remains: I want to be able to reopen my last closed tab with cmd+shift+T. 

Near as I can tell, it's not a matter of making a keyboard shortcut in System Preferences, since Safari does not have a menu item for opening the last closed tab. So how else can I go about this? 

(I've got one slot left available in the free version of FastScripts, so it'd be handy if there were an AppleScript solution for this.)
Try clicking ⌘-Z (for undo).