Ohhhh! I love your Savannah... and your others are sweet, too. I like the first one's face.
Anyway, my kitty (Ziggy below) is half Savannah, supposedly. My husband picked him up from a "free kittens" backyard breeder for our two year wedding anniversary. A month later, we get a call from the family because they had news. They kept the dad around because they though he "looked cool." The morons didn't know that you could have a lost cat scanned for a microchip at first, but eventually they got it done... and they called us when they found out his true identity. The father was a lost stud for a Savannah cattery! Cool, huh? Ziggy doesn't look very Savannah in his coat, but his physique is very Savannah.
BTW, Savannah are half or more Bengal or other domestic shorthair (I think they have to be a Bengal or a couple other breeds, though) and half or less African Serval. http://www.serval-cats.com/serval-cats-pictures.htm
There's serval pics on that link... they're fairly big (bigger than the other cats used as hybrids) and they are sooo coool looking.
They have BIG ears and looooooong legs.