You should check out Neil Gaiman's latest blog post: Entitlement Issues

He responds to a fan letter asking for his opinion on delays in book series, making very specific reference to George R. R. Martin.

Neil's response sums up my feelings on the matter, is to the point, and encapsulates it perfectly in a single phrase:
George R.R. Martin is not your bitch.

Start the T-shirt orders now :P