In the books (maybe the final one) there is a moment where Gollum shows a glimpse of his 'humanity' and wants to help Frodo but then Sam is a dick to him making him revert to the 'nasty hobbitses' mode and ruining his chance at redemption.
Sam, I may love him in the films but he doesn't half piss me off in the books.

Gollum in a way was my favorite character and in a may more important than some other characters in the story. At least to me, he helped keep a structure. Gollum was never a good or bad guy, at all; in a way he suffered from a multiple personality disorder. He did his best to fight it but ended up failing.

I think we should see a short story all about Gollum and his life. He was a really interesting character that was written out well.