Re: what is with martin and killing of characters *spoilers*
I'm not really convinced that GRRM has done anything different or pioneering with the use of character death in his works - essentially, he's created a wide theatre of secondary characters, so their life and death isn't so huge and issue - the fact that he's created such a huge cast means that it's inevitable that he's going to kill some of them during a story involving protracted civil war.
The main protagonists in ASoFaI are characters such as Jon, Bran, Daenerys, Arya, Sansa, and Tyrion. If GRRM were to kill these then that would be more daring.
Ned was obviously marked for death in the very first scene in Game of Thrones after the prologue - we saw the symbolism - it was no surprise to see him killed.
The *only* major character death IMO is Catelyn - but frankly, she was already spent as a character by book 2 and there seemed little she could do to impact the major plot arcs - she was a bystander. From a writing point of view, it made sense to kill her.
As for other deaths, such as Robb, Renley, and others - these were not Point of View characters - ie, they were not protagonists, so they were always expendable anyway.
Overall, I don;t see GRRM's use of character death particularly different to any other novel - it's simply that he has such a huge cast that you see more names killed.
Now, if he started killing off Bran, Jon, Arya, etc, then that would be more pioneering, though I suspect disappointing for many readers.