I thought they could be, but as I\'m not putting my money where my mouth was (so to speak) setting the readonly attribute doesn\'t actually seem to do anything.
I\'d
The main reason people would like a read-only check-box and (as well) a read-only radio-group is so that information that cannot be changed can be presented back to the user in the form it was entered.
OK disabled will do this -- unfortunately disabled controls are not keyboard navigable and therefore fall foul of all accessibility legislation. This is the BIGGEST hangup in HTML that I know of.