Joachim:
I wonder how it will work at narrower browser widths.
The Web Policies say that pages must be fluid, not having a fixed
width, supporting a minimum screen resolution of 800x600 pixels.
This certainly might conflict with the big splash banner and the next
column with promo banners as
Lee is doing a nice work with components and pages structures at
http://live.gnome.org/GnomeWeb/LayoutPlanning
Have a look to this no-lookfeel proposal of wgo homepage structure:
http://www.leetambiah.pwp.blueyonder.co.uk/downloads/layoutPlanHome0.3.svg
Tip: open it with Inkscape or similar