Walt, those are pretty good windows-looking-like linux shots! (if only they weren't covered in internet explorer and all that crap!) but i'm less than convinced by the mac-alike ones. i thought the red hat button was very amusing on your windows desktop.
somebody posted a screenshot in the screens thread that was windows running blackbox. pretty confusing.
personally i think you might as well run linux if you want it to look like that, but each to their own. i can't really talk, remember i went through my phase of trying to get mandrake to look like windows?