I just want to offer some advice, seeing as after haing to play through twice in a kitten search, I have determined which two were the ones I couldn't find.
First of all, the orange marker for kitten 96 is WRONG, the kitten is further up the road behind three yellow newspaper dispensers. For the correct location look at the old xbox version map, the little kitten symbol has it in the correct place.
Secondly, kitten 100 appears to be on the main street, when in fact it is on the street parallel to the main street, one block north.
I hope this helps, I had similar trouble with The Incredible Hulk. I am not even willing to go searching for the last 8 orbs in Crackdown.