I'd like to express my congratulations to the developer who simply "bolded" those page titles (in watchlist) for watched pages having unseen changes. It like that; it's simple and efficient.
Tom P.S. My garish-green updated marker has other, further advantages as explained in [1], but admittedly not everyone liked that; users can opt-out in EnotifWiki versions. [1] http://meta.wikimedia.org/wiki/Email_notification_%28documentation%29#Update...