Brion rwote :
Alternately, a username could be passed as a query
string parameter,
either along with a password/hash/token (potentially unsafe -- this
will appear in proxy and server logs in addition to going over the
wire raw) or after an explicit opt-in by the user to allow reading the
watchlist without authentication.
Public watchlist option may be great both for RSS feed and for sharing
watchlist (ie. a watchlist for a WikiProject that all people interst in
may be able to check). Additionally it may be useful to have a 'only new
page' filter in RSS (but perhaps it already exist).
Aoineko