osgiliath

The Palantir of Osgiliath is referred to as the "master-stone". What properties did it have that made it greater than the other six Palantiri in Middle-Earth. It's said to be the largest of the seven, so big that a man couldn't carry it. What could this giant Palantir do that the others...

Is there any mention in Tolkien's writings about whether Osgiliath becomes the capital of Gondor again after the destruction of the One Ring and the subsequent fall of Sauron? Or is Minas Tirith (or is it once again Minas Anor?) to remain the permanent capital that it became later in the Third Age?

I was just reminded of this by some one's sig, i think it might be Lamarievenstar's but I think that one of the most powerful bits in TTT, (the film, it's not in the book) is when Sam and Frodo are in Osgiliath, and Sam is talking about the great tales, and why they are so great. And while he's...

why didnt sauron attack osgiliath with his FULL force there and then???

I've been trying to understand the Frodo-Nazgul face-off at Osgiliath. Upon first viewing, it made absolutely no sense. What would Frodo's motivation be? And why would the Nazgul fly away without going after the Ring? (because of an arrow from Faramir? Pleeeease...HE CAN'T BE KILLED!!)...