Dell D620 "Extra" folder
Full working¹ solution for D620 running Snow Leopard 10.6.3 thru 10.6.8
(the download still says 10.6.6. but it's been tested √)

¹Note: only for D620's with GMA950 27A2 card.
ie. it probably won't work with GMA950 27AE, and definitely not NVIDIA X3100.
It has worked on all Dell D620's (GMA950 27A2) that I've tried, except for a particular one.. ☠

Instructions:  Install MacOS (any version from 10.6.3 to 10.6.8) to an external USB device on another Mac / Hack²  Drop this folder into the root (or create a folder called Extra at the root and copy the contents of my Extra into it)  Install latest Chameleon to the device (you should probably repair permissions with Apple's Disk Utility at this point)  Plug the stick into the Dell (back ports are best). Start the Dell and press F2 to enter setup. In "Boot Options" set it to boot from USB device.  You may need to plug in an external mouse and / or keyboard because you still need to install the VoodooPS2 driver. Also install VoodooHDA for sound, VoodooPower for cooling) You should now have a bootable Dell D620 to install / clone to / from. For creating a working installer, it's the same procedure except you have a cloned image of the InstallDVD on a USB to start with rather than an installation.

²Useful tip for Dell D6xx owners
The hard drive is very interchangeable - just undo the two screws on the bottom and the drive slips out of the side..
Now all you need is a SATA to USB adaptor or an external 2.5" drive casing
You can install or clone MacOS to the drive using a real Mac or Hackintosh.


Contains:
 EFI string for GMA950 in boot.plist
 DSDT.aml
 com.apple.boot.plist with many tweaks
 kexts carefully selected for 10.6.8 on D620

Chameleon, Chameleon Prefpane, VoodooPS2, VoodooHDA, VoodooPower, Kext Wizard, Champlist in "Supporting Files.zip"


Thanks to Leppy and his original guide.
I'm not sure how much of it I'm still using in here (it's a mish-mash of solutions, none of which worked on their own)
- but his was the well-written basis for getting this working.

Note: to those of you trying to get Lion running on their D620s: it will depend on the processor which in most, maybe all (?) cases is CoreDuo, not the required Core2Duo. Snow Leopard will report this as Core2Duo in System Profiler, so check using CPU-X.