Hi Calvarez -- have similar requirements like you (have lots of technical papers on A4 pdf format that I would like to have available when mobile). I don't think the Nokia N800 would be the solution for me: although its screen at a resolution of 800x480 in landscape (scrolling is no problem) even beats the Iliad in portret (scrolling is not an option with eInk), the screen with a diagonal of 4.1" is simply too small.
Saw a video on Youtube demonstrating the pdf capabilities of the N810 (same screen size and resolution):
click here.
Perhaps wait for the next generation of 9.7" eInk readers?