Ok, I'm more with it today and can perhaps contribute answers that make sense instead of just randomingly listing books - hello - did I even read the first post yesterday?
As to what I would like to see more of in YA SFF, well...
I'm not a big fan of the simple, cliched books that get a lot of attention. The afore mentioned
Eragon. Ok, kids and some adults enjoy it for the simple reason that it is easy-to-read fantasy requiring absolutely no thinking whatsoever, as everything is spelled out right there on the page. If it was written by an adult, I don't think it would've ever gotten picked up by a major publisher. It's too easy-to-read in my opinion. So easy in fact, that I could not get through it
I want to see books that make kids think. Take Lois Lowry's books for example. Her book
The Giver is very Anthem (Ayn Rand) or Fahrenheit 451(Bradbury), all books with a message, a mature message that makes one think about where society may be headed - PC living at it's best may not be the end all way to happiness. And kids 'get it' when it is presented in well written prose. I think many authors make the mistake of thinking kids/teens don't deeply ponder over important issues.
It's a simple thing, but I would also like see more SFF with boy leads. It may be my imagination, I don't have numbers here to back it up or anything, but it seems that most of the books that are coming out now are girly types, and many boys have trouble reading and liking books with a girl protagonist. Girls seem better adjusted for reading almost any type of book, but boys still seems to suffer under societal pressure to be macho or something and read only 'boy books'. My 8 year old is already succombiing to the pressure. It would be an intersting study to see if this carries over into adult literature. Sure not, right?