Awhile back I asked a question about custom key bindings in Xcode. I ended up recreating some of TextMate's key commands in Xcode. Just updated to Xcode 4 and it appears that the PBKeyBinding file no longer has any effect. What's the new hotness for custom key bindings, specifically for Xcode 4?
You can use Keymando to create any keybinding you like in Xcode 4 and any other OSX application.