This is a bug for icon-naming-utils. When you "mount" a connection to a smb server in Nautius (using File->Connect to Server..), the icon that will appear on desktop will use the icon gnome-mime-x-directory-smb-share. See also this[1] on nautilus devel list http://mail.gnome.org/archives/nautilus-list/2005-December/msg00070.html
Created attachment 4280 [details] [review] The proposed patch
Fixed in CVS. You missed the other two smb MIME type icons btw. There's also one for workgroup, and one for server. :) Thanks for the bug report.
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