Right now, I'm using Fresh Step, which is made by Clorox.
I used to love Scoop Away, but they went through a bunch of formula changes, and I found that it tracked out on their paws way too much.
Fresh Step seems fairly good, although it has a more chemical smell to me than Scoop Away did. It has the benefit of being sold at the local supermarket, as is Tidy Cat and Scoop Away. Since I dont drive (I live in NYC) I use a folding shopping cart to lug stuff like litter home so the less I have to travel the better.
I've tried Litter Pearls, but thought that they developed an odor much more quickly than the product claimed to. One of my cats didn't like them at all. I've also tried some of the litters made of alternate substances, such as Yesterday's News and Feline Pine, but I didnt like their odor.
Do the people with several cats find Tidy Cat to be good? I've only tried it once.