I'm currently re-watching this from the start. Anyone wanting to join me; go ahead. But make sure you research the episode numbering, as the episodes weren't aired in order.
You can find the episode listing guide here: The Melancholy Of Haruhi Suzumiya Episode Guide (Wikipedia)
I'm watching them in chronological order (not the broadcast order).
I recommend it to you all. It's different from anything else you would have already seen.