Coming out on DVD and BluRay this coming Tuesday May 17 is "Vanishing On 7th Street". Directed by Brad Anderson, starring Hayden Christensen, John Lequizamo and Thandie Newton.
The entire population of Detroit completely disappears into thin air after a blackout leaves the city in total darkness. A group of survivors gather at a pub and try to figure out what's going on and where did everyone go. As the sun starts to set, it becomes clear that the darkness took everyone and now they must stay in light, which is quickly disappearing to stay alive.
I'm thinking "28 Days Later" meets "Darkness Falls"