@Fubaka: Since the KS+ level editor gives a description for every object, I don't think there's a need for this anymore. Having the information in the editor is far more convenient than looking up this thread. Granted, not everyone uses the KS+ editor, but since it works for original KS levels too, everyone should be using it.
@People who came here for object information: You can get the editor I'm talking about here -->
egomassive.com/ksHover your mouse pointer over any part of the editor an press F1 to get a description of it's function. You may think this is shameless self-promotion, but you're the reason my editor has this functionality.