The Siri personal assistant application for the iPhone 4S has been ported onto the iPhone 4, supposedly proving that the older hardware is capable of running the app.
Developer Steven Troughton-Smith installed the Siri and Springboard files from the 4S onto an iPhone 4 and was able to get it working on the previous generation device.
9to5 Mac, which is working with the developer, reports that the app can recognise your spoken commands and speak back to the user. It also works in both standard view and on the keyboard dictation view.
Naturally, Apple is not authenticating commands to its servers [...]
Apple released Lion Recovery Disk Assistant that let you allow to create recovery on an external drive which is capable to reinstall Lion, repair the disk using Disk Utility, restore from a Time Machine backup, or browse the web with Safari.
Note: This is necessarily important to remember that user can create an external Lion Recovery with Lion Recovery Assistant application while their Mac has an existing Recovery HD.
How to Create USB Recovery Drive with Lion Recovery Assistant
Download Lion Recovery Disk Assistant application
Attach your USB or insert an external drive