No, they're determined by a list on meta which can
only be edited by a
meta admin:
http://meta.wikimedia.org/wiki/Interwiki_map
Suggestions are made on the talk page.
Interwiki links are handy, sure, but what a way
to get around the
nofollows. I assume that *wasn't* by design?
One would hope the meta admins are on-the-ball enough to add only
decent interwiki links :-)
Okay, that makes some sense.
Now, why the hell aren't they nofollowed along with everything else?
-Jeff