Yes, I snap off the plastic part of the shadow (the thing that holds the pan) and then put it on a fork which I hold over the flame of the candle. Once the plastic starts to smoke, I know I will be able to pry the metal pan away from the plastic. I use the xacto knife to push it up so I don't have to use my fingers. It only takes a minute or two to de-pot.
Then I immediately push the plastic thingy back into the original shadow container and snap it shut.
Then it goes back to Mac (with 5 others) for a free eye-shadow.
It's just easier to use and see them when they are all laid out in a palette and it's especially nice if you place them in the palette according to the colour spectrum.
I don't have many MAC shadows in pots, but I've been reading about depoting on other forums. I think that it's really smart and if you have the time and patience to do it, go for it!