Here's my experience install Lion on Dell Latitude D620
Purchase Lion Installer From Mac App Store
Download myHack Tools from http://myhack.sojugarden.com/
Download EDP or boot pack pick one according your notebook and graphic card from http://www.osxlatitude.com/edp/bootpack/
Extract BootPack from osxlatitude, put it somewhere on your desktop. ( it's containing Extra folder )
Open MyHack
Create USB Installer Lion using myHack
After Finish with creating usb installer
Open MyHack again
Install Extra ( my own extra ) from MyHack using boot pack downloaded earlier
Option :
You can resin tall Chameleon with the new one.
