For those of you who have never seen a jaguarundi in person, this photo is a bit overexposed - they are actually much darker than this. (Otherwise, though, a nice shot - I like the sense of motion and the dramatic black background).
I have only seen the single jaguarundi, at the Emperor Valley Zoo in Trinidad and Tobago, and it was close to black in appearance. They are definitely much different than most other cat species, and are quite sleek and fluid in their movements.