IMO Tom and Goldberry are two of the most important characters in the story, both for what they are and for what they are not. True, they refuse to get involved in things outside their own forest and that's not exactly admirable, but Tom, who is Master and the River's Daughter teach us all some very valuable lessons that are touched nowhere else in the books.
Shalom.
That's true. To me, it was a tease. I thought they would come back later in the series. To introduce such powerful characters only to have them drift away wasn't what I wanted to see.
Will Fangorn and the Ents be in The Two Towers? I don't seen them listed in the The Two Towers credits.