Saw it this past weekend, decent movie, but I'd also seen the original Swedish version and read the books, so there weren't many surprises, except for what the filmmakers put in as changes or left out.
A neat little bit was a chase scene near the end, where Lisbeth is chasing a car on her motorbike. When the car crashes, she advances on the wreck with the intent to do the driver ill, and the means, which looked like a SIG 228. She cocks it (not racking the slide, just the hammer, having checked it earlier), but before she has a chance to use it, the car explodes. She's then shown holding the pistol, finger along the slide, and actually uses the decocker to lower the hammer, a bit of decent gunhandling.
The director, David Fincher, has done previous gun bits very well (see Seven), so I guess it shouldn't be a surprise he'd make sure his actors were properly trained.