As has been said, pine is not a good choice. Some people debate that kiln dried pine is fine, but studies have proven that this is false. They have significanlty lowered phenol content, but the phenols are still there. I used kiln dried pine before I knew it wasn't the best choice, and I could smell the phenols in it.

What I find that I like best is aspen shavings. I use a caullander (sp?) to sift the dust out. It has better odor control than anything I've tried (except the pine which had superb odor control). I use the aspen in their litter boxes, and they have rags for bedding.

I've tried Yesterdays News cat litter. I hated it. The rats hated it. It's quite hard, the odor control is terrible, and one of my rats is allergic to it.

I tried Timothy Hay. TERRIBLE odor control, and it was difficult to tell how sanitary the cage conditions were.

I tried Aspen moss. It didn't last long, didn't have good odor control, and was expensive. It was very comfy though.

I tried corn cob (Kay kob) bedding. It was hard and didn't absorb well, and it molded in two days.