Several posters have proclaimed "I must have my D??? by this weekend because I have a (whatever) event to shoot!!).
I would never use a new body on a paid assignment unless it was to carry it and fit in a few 'don't matter' images just to play. Particularly if the new body was as fundamentally different as the DX/FX difference that I will be experiencing. For this reason I will break in the D700 for a few weeks before I trust it and myself to anything that might influence my reputation.
I am curious if there is any paid shooters who would jump into an assignment with a new piece of gear as significant as a body without that break in period. Maybe my set in stone ways need examining?