There really is no cliffhanger....
If I didn't know about this being a trilogy, I would actually think that the story has ended because, imo, I don't see anything that's been untold or unfinished.
*SPOILER ALERT*(first time ive ever had to write that, lol)
I'm guessing that the very last scene where she puts a gun up to her head is the cliffhanger but if it was, it didn't do it for me. I've never read the books though and never heard about any of this until the first movie came out so I'm sure the die hards can see the cliffhanger. But again, I don't see what questions there are for the 3rd movie to answer. Maybe someone can enlighten me.
Btw, Kate Winslet is freakin' HOT in these movies. I think I'll date her for a couple of weeks so I can bump uglies a few times but after that I'll have to move to Iggy for the obvious reason!!!