X4Shortcuts is a lightweight shortcut reference for mac and iOS developers using Xcode4. It's every time available in the menubar and acts like spotlight. You can search the iOS or Mac Developer Reference, Google, or over 300 shortcuts that are still available. Many more features will come when the resonance is good.
Give it a try!
For further questions feel free to contact me at email@example.com
What's new in X4Shortcuts
Add your own search engines
Choose your own keyboard shortcut
Activated system commands (copy, paste, select and so on...)