I found these on Lifehacker:
FlixWare searches title, actor, genre, year.
Netflix Instant Watch Tracker searches by title, actor, and genre
InstantWatcher.com is very versatile, with searches by title, actor, genre, new, expiring, best, worst, and random. Includes links to play or add to queue, if you're logged in. Includes pop-up title synopses. Free and no registration required.