Prowler, yes it's a little odd at first. The Color channel is the most obvious, but it's also the most likely to use an image map -- well the most likely at the time the layout was designed. But the options of image maps for Bump, Transparency, Reflection, etc. do follow a kind of pattern, and although it seems a little odd at first (with windows that "open up" and change), I'd like to add my assurance that it isn't something that will perplex you forever. After a little time in the material editor, you'll begin to see where the similar ways of doing stuff are, and then all of it will suddenly be familiar for you. Sort of like learning to ride a bike...takes a little practice at first, but once you've got it moving, you've got it. :)