hairy_hen said:

They don't 'take their bodies with them'. They transcend the need for physical existence altogether.

It's meta, man. Deal with it.

That doesn't explain why Ben and Yoda's bodies faded away after they died but not Anakin's.

SilverWook said:

It was also a way to communicate to the audience Ben isn't just a crazy old man on a damn fool idealistic crusade. There is something to this Force stuff.

Ben's death in the Marvel comic is kind of graphic though.

Graphic? Comically stupid is more like it. =P