Michael, you are a tease...:-)
On the subject of FF, I reckon it's a pointless Holy Grail. I recently tested the 1Ds2 and the D2X side by side and the differences were almost insignificant as far as print quality was concerned. The Canon was indeed slightly better but not by an amount related to the price difference.
What was interesting was that for the same FOV the Nikon using the 12-24 was better at the edges than the Canon with either the 17-40 or the 24TS.
This is significant. The Nikon has all the advantages for birders of the 1.5 crop and can still do good W/A with the excellent 12-24. if I wasn't already a Canon man I would be looking seriously at the D2X...
THIS is what I want from my next Canon. The so-called advantages of FF are meaningless if the available W/A lenses are not up to the task.
Give me a high density, smaller chip anyday. This new camera, if the rumours are true, is a step backwards in many ways. If it's 12Mp then that is less pixel density than the 350D!
Guys, it's not about FF or not, or even how many Mp. It's about convenience and cost.
You can get as much 'quality' as you like. Just shoot 8x10 film, or bigger. Or shoot complex multi stitches like Jonathan. Time consuming and fiddly, but the pure quality will be amazing.
Quality, convenience and affordability - pick any two.