stacy,
i shoot architecture, interior and furniture most of the time with the ZD and the 5D. these are my findings: I am still looking for a better/perfect system, but cant realy see ONE system for both fields of work. while quite similar, architecture and interiors idealy require different cameras. as you know, architecture can be shoot with a cambo/silvestrie... without problems since DOF is quite large and things are usualy more than a few yard away. so focusing is not so crucial. with interiors one sometime needs everything in focus but a lot of time you want also a thin DOF and here exact focus is needed. this is more easily done with a ZD or canon typ of camera. I find the focus-confirmation on the ZD to be very helpful!
also, I find myself often in a hurry shooting interiors (limited granted time to shoot), so a cambo-setup would be to slow for me.
when I have the choice, I always pick the ZD over the 5d (wich I only use with the sigma 12-24). there are a lot of lenses available for the mamiya (old schneider curtagon, zeiss jena, hasselblad, russian/ukrain lenses, apo-rodagons - all with adapters) but still I feel very limited at the wide and shift side. When you think of using an RZ for architecture/interior I cant imagine how you would cope with the even less wide lensselection because of the crop-factor).
One negative side of the ZD: with interiors I mostly end up with exposure time between 2 and 8 seconds - and these are the limits already for the ZD. over 8-10 seconds the files are useless. my heart sinks every time I have to take pics of dark interiors.
one cam/lens combo to look out for, might be the 1DSIII with the new nikon 24mm shift lens, if that lens proves to be a winner (and if you can adapt it to the canon).
the canon with the 24mm shift, the 35mm pentax/zork and the sigma 12-24 would be a pretty good and not to expensive ALLROUND architecture/interior setup - for faster shooting but with slighty less resolution and (quite a bit) less dynamic range than the alternative:
if you can aford two systems, I would consider an mf back (that has no problems with exposures over 10 seconds) and which you can quickly change from a cambo... to mamiya... (or whatever makes).
stefan
