Many stock photos are of isolated objects.... isolated either on white or some other neutral background.
This isolation I believe... I may be wrong so if I am please correct me - happens at source. i.e. The Image is placed against a neutral background in a studio set-up in which lighting is done such that shadows are eliminated. Softboxes, fill-in flash and reflectors would be the tools of the day.
I feel that isolation is done at source as to try and do this during pp, using Photoshop or whatever other photo editing suite you have, can be rather tedious and times consuming. Again... this may be true to me due to my mediocre skills on PS.
Anyway.... to stop beating around the bush... I tried my hand at some improvised studio shoots using diffused natural light from the window, a silver tray as a reflector, a sheet of blank white paper to provide the neutral background and my trusty Nikon D80 set up on a tripod.
The results as seen here are quite satisfactory I think!
Lemme try again....
These are the images I had attached to my previous note on isolating objects at source rather then in pp!