In reply to Jimbo W:
The Awakening was overlooked last year, as it was assumed to be a bit derivative of The Others (it's not). Maybe not the instant classic that I hoped it would be, but worth a look. Arguably more a "psychological thriller with a bit of supernatural in it" than a "makes you jump sky high" type thing, but do give it a go!
Also a late 60s Hammer offering, "The Devil Rides Out". The scariest Hammer film I've seen, by a LONG way. Bit of a cop-out finale but up till then it's just great. Mostly thanks to Christopher Lee's performance.
Poltergeist still works well too, even if some plot points are a tad illogical.
If you want something else more recent, last year's "Sinister" had some good scares in it (overall a bit uneven perhaps, but as you might gather, it's hard to find something where everything is perfect!)
A short Spanish feature "El Habitacion del Nino" starts well but loses it in the finale, but again still worth a look. It's about infra-red baby monitors showing a father some sort of ghostly goings-on...