Ubuntu 10.04.1 - nvidia, resolution up to 1680x1050

1. Install recommended nvidia drivers
   System > Administration > Hardware
2. run (as root, from consolt) nvidia-xconfig
3. edit /etc/X11/xorg.conf

xorg.conf

Locate HorizSync and change it to 28.0 - 65.5

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 65.5
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection