I just finished the last of the three Swedish movies of "The Girl w/the Dragon Tattoo" series. I've read the books and I really think the movie adaptations are excellent. If you are looking forward to seeing the American version directed by David Fincher, I would go down to the library and take out the Swedish versions first.
Also,if you caught any of the Swede one's and thought the actress who plays Lisbeth Salander looked bad ass, check out this Charlie Rose clip of her from 6 months ago. ( about a 1/3 of the way down the page is the interview).