I have just upgraded my new Dell computer that came with Ubuntu 7.04 to the pre-release version of Ubuntu 7.10 (Beta). Please read my initial review of this system.
After a large download and subsequent reboot, this computer came up in much better shape than it was in 7.04. Most notably, it detected the correct resolution and came up in 1680x1050. I also had many more resolutions to choose from. Instead of the three resolutions I had before, I now have six choices.