Well I too have a successful install on D820 my hardware specs are slightly different 1.83ghz Intel Core 2 Duo, NVIDIA Graphics card, 3GB Ram, 160gb hard drive. So far I have:
Wireless
Bluetooth
External VGA Port
Sleep
Not working:
Network hard wire port
Keyboard reports no keyboard connected on startup but keyboard works.
I have been using the machine for a couple of weeks now when I have to do presentations. Keynote has worked like a champ and the DropBox keeps files in synch with the other mac's to give it a unique look I actually gave the new machine the look of the old Acer Ferrari. This is how the unit currently looks:
I know its campy but so is the owner. The Acer Ferrari is a laptop I loved too bad you can't get them anymore. But I guess I now have my own version!
Here's the machine running Lion
My advice follow the instructions to the letter and you have a very good chance at getting your latitude running. If anyone has a driver to try for the stubborn network card and the bluetooth keyboard message that would be good too!.