I've gone ahead and committed the new page protection UI. This allows seeing exactly what a page is set to, and logs a bit more information; so no more "hey, is this page really protected or just protected against moves?".
It's a bit more complex, but hopefully not too scary.
Additionally there's a new level between unprotected/default permissions and sysop-only; this is set up on en.wikipedia.org and will restrict edits by unregistered users and accounts less than four days old.
(This is to implement http://en.wikipedia.org/wiki/WP:SEMI )
There's now a timestamp field on the user table for the registration date, which is used to calculate the age (this'll be included on newly registered accounts but is NULL on older ones).
The age setting replaces the percentage formerly used for the sitewide move limitations.
-- brion vibber (brion @ pobox.com)