The display brightness can be changed very easily. You just need to press the Fn key + Up/Down arrow to increase or decrease the brightness. Although the settings for the brightness revert to what is set in the BIOS after a system restart. For example, the BIOS setting says that the brightness is set to 3/10 when on batteries. You take it to, say, 7. When you restart, it'll be at 3/10 again. You'll need to change it from the BIOS to make it permanent. By default, the brightness in the BIOS on batteries is at 3/10 and on power is at 10/10. This is unlike the HP mechanism which I find less tedious.
My DVD drive is working absolutely fine... although I don't use it a lot.
I find all the colors of XPS worth getting... blue would look good too...
All the drivers are at Dell's site (for Vista 32 and 64 bits). And the drivers for Vostro work for XPS when using XP, i think.