Before approaching the Writers Guild Nominations with Oscary enthusiasmbe forewarned: only guild members are eligible for these prizes which discounts a good chunk of the movies one might otherwise expect to see honored each year. Hollywood isn't nearly as averse to working with non-guild writers as they are about non-unionized actors (Beasts of the Southern Wild was the only significant "ineligible" situation when the SAG nominees were announced a month ago). One of the reasons for this is surely the prevalence of writer/directors who are often members of the DGA without being members of the WGA.
The benefit of this is that by their script eligibility rules they are forced to award films that have been largely ignored in the grand scheme of year end hoopla. The curse is that when you are nominated from a smaller field of potentials it might not feel as notable.
not eligible and therefore unsnubbed so you could still see them on Oscar's list:
Django Unchained, Seven Psychopaths, Amour, Your Sister's Sister, Take This Waltz, The Intouchables, Middle of Nowhere, Rust & Bone and The Impossible
Typically we only here of what's been declared ineligible so it's tough to know what other films were competing although I'd feel worse for actor/screenwriter Reid Carolin's absence for Magic Mike above if he'd also played one of the Cock-Rocking Kings of Tampa. That'd be putting it all on the line for your movie!
not eligible and therefore unsnubbed:
Les Miz, Beasts of the Southern Wild, Anna Karenina, The Deep Blue Sea, and The Best Exotic Marigold Hotel
The nominee list for the WGA is highly plausible as the final Oscar list in this category too, don't you think?
DOCUMENTARY SCREENPLAY
Sugar Man, Mea Maxima and The Invisible War continue to show real strength in the oncoming Oscar Best Documentary race.