I have noticed quite a few references to Martin's works too.
Some of the book titles you come across for instance (always multi-volume XD). Ice wolfs? All the major houses behave like the houses of Westeros, and have their own animal sigils... I think Bethesda employee's are likely fans. I might mention that the whole college is like a reference to another book series many people tend to read.
I am very intrigued by the dwemer ruins I've come across so far. I dont remember anything about them from Oblivion.
Another thing I've noticed is the adoption of many of the most popular features from Oblivion mods. For instance the crates and stuff open when used and tell you if they're empty, ingredients disappear when harvested (in fallout I know), there's a decapitation perk at higher levels that came from the Deadly Reflexes Omod...