First I ended up devouring "The Girl who played with Fire" and "The Girl who kicked the Hornet's Nest", and hence wrapping up the Millenium Trilogy.
What I loved about all three books (besides the characters) are the fact that the genres are actually so different. "..Dragon Tattoo" is a mystery/thriller with a gruesome finale. "..Fire" read to me like an action novel, and "... Hornet's Nest" is at heart a journalist/courtroom drama. There's liberal doses of action, intrigue, romance, general gruesome-ness and strange relationships thrown in all three, and that just adds to the appeal.
The success of the books (note the breaking eBook sales numbers) suggest there are tons of people agreeing with me. I'm holding off on watching the Swedish film versions for now.
I also just finished Fault Lines: How Hidden Fractures Still Threaten the World…