I wouldn't replay it if I had just completed OOT, since the overall game would be basically the same, but it's a very new experience a few years after you complete the original since the dungeons are fairly different. I was stuck on the redux of Jabu-Jabu for a long time. The cows they stuck in there and all that...It really confused me.
@rhawn: It's just the original Ocarina of Time but they added in some extra puzzles in the dungeons and changed things around a little. It was originally released on Gamecube with a pre-order of Windwaker if I remember correctly. I am not sure, but it might be available in other forms like Wii's virtual console now.