Hey, I'm a new poster here and actually made the account so I could ask you a few questions about your D620.
I just purchased one from dell and is in the boxing stages. I opt'd for a very similar configuration as you did except for the 7200rpm drive (speed), 2Ghz Duo, and I think thats all I noticed was the difference.
I also am going to upgrade to 2GB Ram from newegg (sweet deal on 2GB for $145 or so).
I know you said you were gonna get some more games in this weekend just wondering what your thoughts are on the following:
Have you found any drivers that will help the Quadro with gaming performance, or modded ones?
Do you think games like Tiger Woods, Civ 4, Age of Empires 3, will be able to run on this? I'm not planning to do heavy games, but Civ 4 or AoE3 would be great if it ran on this. I know such things as 2GB ram, 7200RPM drive will definately help out with performance of these things.
Battlefield 2 thoughts would help me too

On a side note, I'm very excited to get the laptop asap so I can play around with it, great battery life, wifi, light weight, and some gaming potential.