I'm an admin on en, and have blocked myself for a week for a wikiholiday. I happened to check my watchlist at work (while being logged in), and discovered rapidly that the admin "rollback" feature is not inhibited by blocking (see http://en.wikipedia.org/w/wiki.phtml?title=Special:Contributions&target=...). Okay, the blocking of admins is a rare occurrence, but I believe this security issue might need addressing...
Jacob