Kinda boring, but I try to never rewatch anything.... Ever. I think I did a 1.5-1.9x on Haruhi, but nothing beyond that, regardless of the anime. When my friend comes over, I tend to rewatch some things outta FMP: Fumoffu, and School Rumble. Overall, though, I don't think there's been any anime which I have watched through more than once, willingly. There's just always good new stuff to watch.