[Bear_in_RoseBear]

Well, there is the consideration that Frodo is being dominated by the Ring... but don't forget, it says right in the book that Sam is one of those who chronicled the story. From "The Grey Havens" chapter of The Return of the King:

"In the next day or two Frodo went through his papers and his writings with Sam, and he handed over his keys. There was a big book with plain red leather covers; its tall pages were now almost filled. At the beginning there were many leaves covered with Bilbo's thin wandering hand; but most of it was written in Frodo's firm flowing script. It was divided into chapters, but Chapter 80 was unfinished, and after that were some blank leaves. The title page had many titles on it, crossed out one after another....
'Why, you have nearly finished it, Mr. Frodo!' Sam exclaimed. 'Well, you have kept at it, I must say.'
'I have quite finished, Sam,' said Frodo. 'The last pages are for you.'"

So it should be no surprise that Sam takes more prominence near the end of the story... he may have been the one writing those parts, or at least editing them!

The parallel between Frodo and Sam, and JRRT and his son Christopher, strikes me as somewhat interesting... I wonder if JRRT knew he would never finish his "history" of Middle Earth?

[billbears]

That's what I was thinking. Somehow, Tolkien is representing a passing of the history, starting with Bilbo, going to Frodo, and finally Sam. Sam is the 'New Age', the last generation directly affected by the Fellowship, but I don't necessarily see he was the main character