Well! For starters i have a cheapo digital camera (sony cybershot 6.0). I use macro setting to shoot toys.
I have a white seamless backdrop on a desk with 4 lights on all sides. I use GE Reveal light bulbs (it takes out the yellow tint).
Then in photoshop I just adjust contrast and the white becomes pure white.
(for the photo you referenced, i had a clear stand propping torpedo up. it disappeared when i contrasted the white in photoshop)