I have a new kitten, too.
Last Wednesday, I was sitting in my upstairs window, when I saw a minivan pull over, into the grass in front of my house, and throw something out the window. The window was open, and I yelled, "HEY!", and the guy sped away.
I immediately went out, to see what he tossed out of his car. It looked like coffee, or something (my view was sort of blocked by trees), but I could find no sign of anything.
The next evening, I was walking around the front of the house with the kids (we were looking for cool rocks), when a little orange kitten walked out from under one of the trees and "mewed" at me. She was scared, but I managed to catch her, and bring her inside. She was very hungry and thirsty, but very sweet, too.
We named her Pumpkin, and the kids adore her. She's about 12 weeks old.
It really makes me mad, when people dump animals like that. I wish I had been able to get the guy's license plate number.