I'm glad to hear you recommend this series - I have the first book somewhere (it was one of the few books that made my "shlep it to England" list), so I'll try and find it. I just read Fire, by Kristin Cashore, which I enjoyed. The library has Graceling (her next book) on hold for me.
Right now I'm reading The Girl with the Dragon Tattoo, based on rave reviews from friends. I don't think I'm sold on it, though. I'm more of a fantasy fan than a psychological thriller type, and so far (200pgs in), I'm not sure that I really give a crap about anyone.
Oooh! Fire! I loved that book. I was lucky enough to get it through Bookgeeks (a website I write reviews for). If you like free books, they have contests every month with giveaways!
Graceling is also excellent. Yes, Glen Cook is a master. And, I also thought "Girl with a Dragon Tattoo" was only meh. I didn't really get all the hype about it. It seemed quite a slog through for me, reading-wise. And I'm generally a mystery-addict, but it just didn't do it for me.
If you liked "Fire", you might like Robin McKinley's "Sunshine". Totally different book (more urban fantasy--more adult than YA type lit) but same kick-butt female character feeling. Or, if you can find her, PC Hodgell's books. Wow. They're amazing.
p.s. while I was teaching middle school I had a "mature" book section in my classroom. Full of books like "Wuthering Heights", "Maus", and "Huckleberry Finn". You would not believe how attractive middle-schoolers find something labelled "mature". Easiest book reccs I ever had. I also made it so, if they were reading "mature" books, they had to talk about them with their parents, which often got their parents reading along. Loved it! Our library had a "good books" section that was mostly created with books the kids had loved and constantly recommended to each other--because they kept coming in and asking where the "good books" were--now we had somewhere to point them!