
As for Frodo, I read a discussion here somewhere where someone said that he and the other mortals that went to Aman would probably not become immortal, but die after a while. The only difference would be that they could find happiness and love for life again in Aman, something they could not find in M-E.
I don't think Frodo regrets he leaves M-E. He stayed there one year after the War of the Ring and he was probably constantly longing for the Ring. When he went to Aman he could shake all of that off him. Perhaps he missed Sam, but somewhere in the back of my head, I don't know from where, I read that Sam, Pippin and Merry went to Aman as well. Also, he had Bilbo with him, and Gandalf. The people he had learned to love was with him, he could live a happy life all his years. If he had stayed in M-E I think those years would have been much much shorter, as the thought of the Ring and the constant longing would have made him fade away. Like Bilbo said after 50 years of carrying the Ring: "I feel thin.. sort of stretched like butter scraped over too much bread". Now he had had the ring while it was still quite passive. Then another 20 years passes and the Ring is starting to wake up. Imagine having it during the one year it is as most active, when it is struggling to get back to its master, deceiving every person who holds it and using all its massive power on the bearer's mind 24/7. That can tear the strongest mind into pieces.
I found that the following two years in march (which is when I think the ring was destroyed) Frodo gets ill. The first time he says: "It is gone now", referring to the Ring. I think that by coming to Aman he can also put that aside and just get to enjoy life for what it's truly worth; The love to your family and friends.
The reason to why there is nothing really written down about this is probably that there isn't really anything to make a story about. They recieved the grace of the Valar and went to Aman where they lived a quiet but happy life amongst those they loved.
[Edited on 23/9/2003 by Airecristiel]