But the thing I want to know concerns Asfaloth ..... the "elf horse" .... is there more significance to that than him being a horse owned by an elf? In the appendixes it mentions Glorfindel riding up on his white horse - surely it can't have been the same one..... or is there an implication of some race of immortal elf horses......?[/QUOTE]
Good point, Mithalwen! I wonder about this too. Glorfindel's horse is pretty bright and able to keep Frodo on his back, just as Shadowfax does with his riders. Do the Elves have - well, Elvish horses, or do they just breed them as beautifully as they do everything else?

Maybe Glorfindel's horse has a meara in his background? After all, the Rohirrim are just ordinary humans who are good at breeding horses, and they can't possibly have found a way to breed the ancestors of Shadowfax. Maybe the Elves did it originally? Does anyone know?