I generally prefer the word technophobe rather than Luddite. Luddite is fundamentally an economic movement (people protesting losing their jobs, and smashing weaving looms and such), whereas technophobe denotes a more irrational fear (I actually get dizzy whenever I use a cell phone, and try to put as much distance between cell phones and me as possible).
...That said, while I will always read a paper book given the choice, I do regularly read stuff online; this is a mixture of subject matter (certain stuff can't be published, either for legal reasons or extreme niche), of length (I will often decide "I want to read something tonight", and in one evening I can get in a couple short stories--4,000 words--but not a full novel--40,000 words), and of practicality (the nearest book store is about 15 blocks away).