It has been brought to my attention that there are a few Fox shows that are expected to be expiring soon. Each of the following titles is set to expire from availability from Netflix streaming Instant Watch as of April 1st:
Better Off Ted
Buffy the Vampire Slayer
King of the Hill
My Name is Earl
If for some reason you've never gotten around to starting or finishing one of these series, I'd recommend doing so now, just in case they aren't renewed. Granted, many of these series are very well known (as well as take up a great load of the current content available on Netflix streaming) so the hope is obviously that they'll be renewed quickly. You never know, though, especially with shows like Firefly soon to be available on cable channels.