We've been using Lizard Litter, but have discovered Jungle Mix and will be changing over to it. Here's some info...
Jungle Mix provides a natural living environment for terrarium animals and plants. It is a unique blend of sterilized virgin organic soil, fine grain sand, vermiculite, peat moss, orchid bark and green tree moss. Jungle Mix is organic, natural and perfect for burrowing reptiles and plants. It promotes breeding, nesting and egg incubation.
It smells like the outdoors and it looks so natural. It maintains moisture very well, especially under the top inch or so, without being damp.