I'm using "obsolete" camera on a daily basis. among these are Nikon D2H (documentary work for studio etc.), D200 (IR and multispectal), D300 (visible reference shots for my UV botanicals; combined with a Medical-Nikkor 120/4), D40X (IR), Panasonic models (GF, GH-2), and last but not the least my Fuji S3Pro and S5Pro for emulated colour IR applications.
My Nikon 1V1 cameras probably are about to become obsolete too if they aren't there already.