the best thing about lotr rings is no matter how many times you read it, you always find something new. or work out some puzzle.
i always love working out the kingship of aragorn. it is so confuseing to me (i don't know why). every six months or so i forget exactly what happened and "have to" go look it up again. and i love reading through the book while refering to the timelines and stuff. it makes for a much more holistic view of teh offten confuluted plot.
another thing is that after you have read it a number of times through, you (or at least i do) start picking it up and reading parts you especailly love. so you get stuck in a rut. sometimes i pick it up and read a part i loved and had forgotten about. i love it when that happens!
so i guess my reading changes cause i find new things all the time.