well, I've made it through the book trilogy once, and that's enough for me, Tolkien is such a profound writer, he just crams so much detail and information in each page, it's a lot to process. I've also read Unfinished Stories by him (arranged by Christopher Tolkien) and since each of the tales in the book are shorter, they're an easier read.
yeah, well, I still read the Chronicles of Narnia over and over!!! I absolutely love them! this past summer I also read a lot of his philosophy books, like Mere Christianity (my favorite) the Screwtape Letters, the Great Divorce, the Four Loves, and some others, and they were quite enjoyable. Have you read any of his other books?