Hi,

I've also experimented a lot. The two big problems I have are dust and tracking. So far the best I've come across is Ever Clean Low Tracking Formula ... it clumps well, has a "mild" fresh odor control scent, no dust and tracks "less". Here is their website http://www.everclean.com/ if you'd like more information.

I have heard the arm and hammer litter is very good but haven't been able to find any (I live in Canada and I'm not sure if its available here?).

There are a lot of great discussions and reviews at http://www.epinions.com/pets-Cats-Litter-All that you might find interesting. Its great if you want to know about the pros and cons of each type.

Hope this helps,
Anne and Darwin