IIS 7.5 Globe with Question Mark Icon
The correct answer was staring me right in the face, though I didn't know it at the time. Apparently this little "question mark" notation on the icon is simply to alert the site admin to the fact that these bindings exist.
As it turns out, you can have multiple bindings of the same protocol (say to different host aliases) and the icon will be just a globe, but when you add additional protocols to the same site, THEN you get the question mark. :)
Have you also enabled FTP on the same site? If so, then this is a known bug and can safely be ignored.