After bowling this evening, I raced from Randwick to the George St cinemas, to see the 9:40pm session of Déjà Vu.
This is the best sci-fi flick I've seen in ages. There's not a lot of high tech, other than a huge wall of computer monitors and a big chamber surrounded by what look like electromagnets. It's the idea that's interesting.
I won't say anything else, because I don't want to spoil things. Note that I tend to suspend disbelief when watching these things, because I'd rather enjoy the experience than pick nits.
Suffice it to say that if you don't have a PhD in modern physics, and enjoy a bit of action and an interesting detective story, I reckon you won't be disappointed!