My struggle for the perfect dual-monitor setup with my laptop and an external monitor finally came to an end.
I always wanted the following features to work:

Big Desktop Setup (two Screens, laid out horizontally)
Different Resolutions (I have a non-widescreen external monitor and a widescreen laptop screen, so i wanted
the Resolutions to be 1280×800(laptop) and 1280×1024 (external) […]

Read the rest of Getting fglrx to work with bigdesktop and two different resolutions